Removes the need for CURL_BUFSIZE

... instead of clobbering the download buffer.

The buffer is needed to receive FTP, HTTP CONNECT responses etc so
already at this size things risk breaking and smaller is certainly not
wise.

Don't clobber the receive buffer.

The definition of TRUE was introduced in
4a728747 and is not used anymore since
e664cd58.
The usage of intptr_t was removed in
32e38b8f.

- Include tool_convert.h where needed.

Bug: https://github.com/curl/curl/issues/1460
Reported-by: Gisle Vanem

Prior to this change it was possible for libcurl to be built with both
Windows' native IDN lib (normaliz) and libidn2 enabled. It appears that
doesn't offer any benefit --and could cause a bug-- since libcurl's IDN
handling is written to use either one but not both.

Bug: https://github.com/curl/curl/issues/1441#issuecomment-297689856
Reported-by: Gisle Vanem

This fixes the following clang warning:
getpart.c:201:17: warning: cast from function call of type 'CURLcode'
to non-matching type 'int' [-Wbad-function-cast]

This fixes missing-variable-declarations warnings when building with
clang.

clang complains:
tool_cb_prg.c:86:22: error: implicit conversion increases
floating-point precision: 'float' to 'double'
[-Werror,-Wdouble-promotion]

Fix this by using a double instead of a float constant.

This fixes missing-variable-declarations warnings when building with
clang.

This fixes the following clang warnings:

http2.c:184:27: error: no previous extern declaration for non-static
variable 'Curl_handler_http2' [-Werror,-Wmissing-variable-declarations]
http2.c:204:27: error: no previous extern declaration for non-static
variable 'Curl_handler_http2_ssl'
[-Werror,-Wmissing-variable-declarations]

It's dangerous to continue to run the test when a memory alloc fails.

clang complains:

curl_rtmp.c:61:27: error: no previous extern declaration for non-static variable 'Curl_handler_rtmp' [-Werror,-Wmissing-variable-declarations]
curl_rtmp.c:81:27: error: no previous extern declaration for non-static variable 'Curl_handler_rtmpt' [-Werror,-Wmissing-variable-declarations]
curl_rtmp.c:101:27: error: no previous extern declaration for non-static variable 'Curl_handler_rtmpe' [-Werror,-Wmissing-variable-declarations]
curl_rtmp.c:121:27: error: no previous extern declaration for non-static variable 'Curl_handler_rtmpte' [-Werror,-Wmissing-variable-declarations]
curl_rtmp.c:141:27: error: no previous extern declaration for non-static variable 'Curl_handler_rtmps' [-Werror,-Wmissing-variable-declarations]
curl_rtmp.c:161:27: error: no previous extern declaration for non-static variable 'Curl_handler_rtmpts' [-Werror,-Wmissing-variable-declarations]

Fix this by including the header file.

Missed in commit 55c3c02e

Commit 80a87e8a broke 'make dist' as it can't handle installing from
absolute target names. Rearranged the dependencies so the absolute name
is used for building but the relative name is use for distributing.

This fixes the following clang warnings:
macro is not used [-Wunused-macros]
will never be executed [-Wunreachable-code]

Closes https://github.com/curl/curl/pull/1448

get_protocol_family() is not defined static even though there is a
static local forward declaration. Let's simply make the definition match
it's declaration.

Bug: https://curl.haxx.se/mail/lib-2017-04/0127.html

Uploads data to an FTP site, directly from memory.

Closes #1451

The module contains a more comprehensive set of trust information than
supported by nss-pem, because libnssckbi.so also includes information
about distrusted certificates.

Reviewed-by: Kai Engert
Closes #1414

No change of behavior is intended by this commit.

It could prevent nss-pem from being unloaded later on.

Bug: https://bugzilla.redhat.com/1444860

Info values starting with CURLINFO_SOCKET expect a curl_socket_t, not a
curl_slist argument.

This fixes the following GCC warning when building the examples with
--enable-optimize:

../../include/curl/typecheck-gcc.h:126:42: warning: call to
‘_curl_easy_getinfo_err_curl_slist’ declared with attribute warning:
curl_easy_getinfo expects a pointer to 'struct curl_slist *' for this
info [enabled by default]
sendrecv.c:90:11: note: in expansion of macro ‘curl_easy_getinfo’
res = curl_easy_getinfo(curl, CURLINFO_ACTIVESOCKET, &sockfd);

Closes https://github.com/curl/curl/pull/1447

Test command 'time curl http://localhost/80GB -so /dev/null' on a Debian
Linux.

Before (middle performing run out 9):

 real    0m28.078s
 user    0m11.240s
 sys     0m12.876s

After (middle performing run out 9)

 real    0m26.356s (93.9%)
 user    0m5.324s  (47.4%)
 sys     0m8.368s  (65.0%)

Also, doing SFTP over a 200 millsecond latency link is now about 6 times
faster.

Closes #1446

The data->req.uploadbuf struct member served no good purpose, instead we
use ->state.uploadbuffer directly. It makes it clearer in the code which
buffer that's being used.

Removed the 'SingleRequest *' argument from the readwrite_upload() proto
as it can be derived from the Curl_easy struct. Also made the code in
the readwrite_upload() function use the 'k->' shortcut to all references
to struct fields in 'data->req', which previously was made with a mix of
both.

- Change prepends to appends because user's LDFLAGS and CPPFLAGS should
  always come first so they're searched before ours.

Bug: https://github.com/curl/curl/issues/1420
Reported-by: Helmut K. C. Tessarek

Follow-up to 11903732, which fixed the
warning in the HAVE_GETIFADDRS block, but not in the
HAVE_IOCTL_SIOCGIFADDR block.

$< is only allowed in implicit rules in some non-GNU makes (e.g. BSD,
AIX) so avoid use elsewhere by referencing the dependent curl.1 file
directly instead. This is somewhat tricky because the file is supplied
in the packaged tar ball (but not in git) but must still be able to be
rebuilt when its dependencies change. The right thing must happen in
both tar ball and git source trees, as well as in both in-tree and
out-of-tree builds.