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Replace jim's proposal into smaller chunks that are IMHO easier to review.

The end result is the same, except for the CHANGES entry and one comment that I
added to r1770752 vs. the Bugzilla patch and that was missing in jim's patch.


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CMake: use CMAKE_REQUIRED_INCLUDES to find APR macros

When using CMake with Visual Studio on Windows, invoking the
CHECK_SYMBOL_EXISTS macro with the full paths to the include files seems
to always result in failure.

Instead, use the documented CMAKE_REQUIRED_INCLUDES variable to set the
include directory, and pass only the headers' base names to
CHECK_SYMBOL_EXISTS.

CMake: use generator expressions to find output files

Multi-configuration generators, like Visual Studio, use a different
output directory (Debug, Release, etc.) for each configuration. To find
the output files reliably, switch to using generator expressions instead
of hardcoding the file paths for PDBs, export files, etc.

CMake: quote installation paths

Deal with installation paths with spaces in them (e.g. "C:\Program
Files") by quoting the arguments to perl and xcopy.
Submitted by: jchampion
Reviewed/backported by: jim


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ssl: clear the error queue before SSL_read/write/accept()

If other modules or libraries do not clear the OpenSSL error queue after
a failed operation, other code that relies on SSL_get_error() -- in
particular, code that deals with SSL_ERROR_WANT_READ/WRITE logic -- will
malfunction later on. To prevent this, explicitly clear the error queue
before calls like SSL_read/write/accept().

PR: 60223
Submitted by: Paul Spangler <paul.spangler ni.com>
Submitted by: jchampion
Reviewed/backported by: jim


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Avoid adding duplicate subequest filters, as they would not be stripped
properly during an ap_internal_fast_redirect.


Submitted by: covener
Reviewed/backported by: jim


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Added a note in the mod_headers docs about Content-Type and setifempty

This note has been added as a follow up of a stack overflow post
(thanks to Michael Allan for the research):

http://stackoverflow.com/questions/29398123/apache-2-4-set-mime-type-of-file-without-extension

After a chat in #httpd-dev it seems that the issue boils down to how %{CONTENT_TYPE}
is evaluated in util_expr_eval.c (r->content_type) vs how setifempty is (only a check
of the response headers). This particular behavior might be a bug or feature,
but it is worth to alert our users.

Submitted by: elukey


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This commit also revert my last one about H2PushResource.
After a chat on #http-dev we decided to make it public since
it holds a Compatibility section.



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The directive will be available only from 2.4.24 onwards,
reverting to avoid confusing users.



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Unified duplicate warning in mod_proxy ProxyPass documentation.

Also changed terminology to be in sync with:
https://httpd.apache.org/docs/current/mod/directive-dict.html#Context

It was confusing in my opinion to read that ProxyPass wasn't supported
for the <Directory> context (since "directory" semantic is already
overloaded).



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ab: follow up to r1733537: CHANGES entry.


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Updated changelog with the last change of mod_proxy_fcgi

r1759984, r1760018 and r1752347 are all changes related
to a bug fixed for mod_proxy_fcgi.

Submitted by: elukey


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Following up on r1764040, add the CHANGES entry.

Submitted by: kotkov


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mod_http2: fixes for compiler warnings



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mod_http2: new directive 'H2PushResource' to enable early pushes before 
     processing of the main request starts. Resources are announced to the 
     client in Link headers on a 103 early hint response. 
     All responses with status code <400 are inspected for Link header and
     trigger pushes accordingly. 304 still does prevent pushes.
     'H2PushResource' can mark resources as 'critical' which gives them higher
     priority than the main resource. This leads to preferred scheduling for
     processing and, when content is available, will send it first. 'critical'
     is also recognized on Link headers.
     
mod_proxy_http2: uris in Link headers are now mapped back to a suitable
     local url when available. Relative uris with an absolute path are mapped
     as well. This makes reverse proxy mapping available for resources
     announced in this header. 
     With 103 interim responses being forwarded to the main client connection,
     this effectively allows early pushing of resources by a reverse proxied
     backend server.
     adding support for newly proposed 103 status code.



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xform


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http: Respond with "408 Request Timeout" when a timeout occurs while
reading the request body.

Submitted by: ylavic
Reviewed/backported by: jim


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