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Fix maintainer mode with GCC/Clang.

Setting -Wstrict-prototypes in combination
with -Werror leads to compiler errors during
configure checks (autoconf generates incomplete
prototypes).

Adding -Wno-error=strict-prototypes lets the
compiler tolerate those.

Possible future enhancement: remember such
"configure time only" flags and remove them
from CFLAGS before generating our build time
files (Makefile, config_vars.mk etc.), so that
the full -Werror is in place during building.


Follow up to r1812263.

As suggested by Joe, add --maintainer/debugger-mode's CFLAGS in
NOTEST_CFLAGS to avoid interractions with autoconf's AC_LANG_PROGRAM.

APACHE_ADD_GCC_CFLAG now also forces -Wno-strict-prototypes for -Werror
to work despite AC_LANG_PROGRAM generating this warning by itself.


Submitted by: rjung, ylavic
Reviewed by: ylavic, rjung, jim


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make the current situation clearer.

I hope the new text is OK for Yann, otherwise I
could revert and add as my own comment.

i think r1812339 should be an integral part of
the mod_journald backport and currently we do not
have any obstacle for the configure.in proposal.
The ap_expr fix was already backported, the
mod_remoteip fix does not apply to the 2.4 code
and the mod_journald fix IMHO should be voted and
applied together with the pending mod_journald
backport.


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* The libnghttp2.pc might be found in lib64 on 64 bit systems
Submitted by: rpluem
Reviewed by: rpluem, icing, ylavic


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* server/util_expr_eval.c (ap_expr_eval_re_backref): Fix gcc 7.x warning.

util_expr_eval.c: In function ‘ap_expr_eval_re_backref’:
util_expr_eval.c:265:63: error: comparison between pointer and zero character constant [-Werror=pointer-compare]
     if (!ctx->re_pmatch || !ctx->re_source || *ctx->re_source == '\0' ||

Reviewed by: rjung, ylavic, jorton


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using NOTEST_CFLAGS.


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* modules/metadata/mod_unique_id.c: Replace use of hostname + pid with
  PRNG output.

Submitted by: jkaluza
Reviewed by: jorton, wrowe, jim


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Same committer shipped a release with one well known broken platform within
days of proposing a showstopper for a platform. This specific platform is not
even universally broken, but only for maintainer mode builds, and same has
upvoted a backport which can't compile in maintainer mode. Confused yet?

It might also be why this well-reasoned patch gathered little review, since
it was parked in a more obscure place?




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mod_rewrite/core: avoid the 'Vary: Host' header

In PR 58231 is was brought up that httpd adds the
Vary: Host header whenever a condition is set to true
in mod_rewrite or in an <If> block.

The https://tools.ietf.org/html/rfc7231#section-7.1.4
section seems to disallow this use case:

"The "Vary" header field in a response describes "
"what parts of a request message, "
"aside from the method, Host header field, [...]"

I had a chat with the folks in #traffic-server and
they don't see much point in having a Vary: Host header,
plus it was reported that Varnish doesn't like it very
much (namely it does not cache the response when
it sees the header, links of the report in the PR).

I don't see much value in this behavior of httpd so
I am inclined to remove this response header value,
but I'd be glad to get a more experienced opinion.



mod_rewrite,core: avoid Vary:Host (part 2)

This is a follow up of r1808746 after a chat
with Yann on dev@:

- the HTTP:Host variable suffers from the same problem
- the strcasecmp should be used to allow case-sensitive
  comparisons.
- in mod_rewrite is less cumbersome and more clean to just
  make the Host header check in lookup_header, so it will
  be automatically picked up by every part of the code
  that uses it. It shouldn't be a relevant overhead for
  mod_rewrite.


Submitted by: elukey
Reviewed by: elukey, ylavic, wrowe


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bumping version, removing some unused code, fixes in base64url from mod_md

On the trunk:

  *) mod_http2: DoS flow control protection is less agressive as long as active tasks stay
     below worker capacity. Intended to fix problems with media streaming. 


On the trunk:
mod_http2: v0.10.12, removed optimization for mutex handling in bucket beams that could lead to assertion failure in edge cases.


reverting r1807238 bc not addressing the issue https://github.com/icing/mod_h2/issues/120

mod_http2: non-dev 1.10.12 for backport


Submitted by: icing
Reviewed by: icing, steffenal, ylavic


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Update offsets

Entry for 2.4.28 regression (r1808855 missing r1805195).

Submitted by: jim, ylavic
Reviewed/backported by: ylavic (RTC per miss in the original merge)


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