This makes it possible to skip the call to unit_stop() in such
cases.  Also use Curl_safefree() in unit test 1302 so it will
pass the memory torture test.

I came up with 33 different ways to call it and verify that it returns the
correct return code.

fail is a new function/macro that a test case can use to indicate a test
failure for cases when the standard macros are not sufficient.

This check verifies that a pointer contains the correct data.

The UNITTEST_START and UNITTEST_STOP defines needed to do a new brace
level so that test cases can declare variables fine and still remain
fine C89 code.

The test runner script now knows if unittests can run and the unit test
setup file says it is one. I also made runtests.pl deal with no
<command> tag set, so that the description file can get even simpler.

When configure --enable-debug has been used, all files in lib/ are now
built twice and a separate static library crafted for unit-testing will
be linked. The unit tests in the tests/unit subdir will use that
library.

This is the first approach at doing fairly clean and easy to write and
debug unit tests.

configure.ac: Test harness libhostname library will not be built for Windows.

runtests.pl: LD_PRELOAD mechanism will not be used to load libhostname
library on operating systems which lack LD_PRELOAD support.

Providing multiple dots in a series in the domain field (domain=..com) could
trick the cookie engine to wrongly accept the cookie believing it to be
fine. Since the tailmatching would then match all .com sites, the cookie would
then be sent to all of them.

The code now requires at least one letter between each dot for them to be
counted. Edited test case 61 to verify this.

They were all wrong previously since none used the <brackets> they
should for MAIL FROM. Now libcurl adds them itself if the app doesn't so
they end up wrong less easy.

Failed HTTPS tests: 301, 306, 311, 312, 313, 560
311, 312 need more detailed error reporting from axTLS.
313 relates to CRL, which hasn't been implemented yet.

This showed a problem when running the test out-of-tree, so
an include path is now being added to pick up the generated
curlbuild.h file.

curl mustn't try to use the control connection after the 421 is received

I also documented the filtering logic in the symbol-scan.pl function to
clarify why not all CURL_* symbols are included.

... and do not send ABOR unless really necessary.

Bug: https://bugzilla.redhat.com/649347
Reported by: Simon H.

Test 580 is removed again for two reasons:

1) Some compilers aren't satisfied by just a data variable called 'test'
when first.o wants a function called 'test'. The Solaris compiler says
"ld: warning: symbol `test' has differing types:" while the AIX compiler
downright rejects it.

2) Test case 1119 that was added after this test is way more complete
and cover everything test 580 does and more without introducing the same
problems.