Commits on Jan 15, 2021

1. build/apr_common.m4: avoid explicit inclusion of '"confdefs.h"' …

   The failure is observed on `autoconf-2.69d` (soon to be released
   as `autoconf-2.70`). There `int64_t` detection fails as:
   
   ```
   $ autoreconf && ./configure
   ...
   checking whether int64_t and int use fmt %d... no
   checking whether int64_t and long use fmt %ld... no
   checking whether int64_t and long long use fmt %lld... no
   configure: error: could not determine the string function for int64_t
   ```
   
   This happens because `./configure` always stumbles on warning:
   
   ```
   configure:3350: gcc -c -g -O2 -Werror  conftest.c >&5
   In file included from conftest.c:31:
   confdefs.h:22: error: "__STDC_WANT_IEC_60559_ATTRIBS_EXT__" redefined [-Werror]
      22 | #define __STDC_WANT_IEC_60559_ATTRIBS_EXT__ 1
         |
   ```
   
   It's triggered by double inclusion of `"confdefs.h"` contents:
   explicitly in `APR_TRY_COMPILE_NO_WARNING` macro and implicitly
   via `AC_LANG_SOURCE` use.
   
   To fix it and avoid having to define `main()` declaration the change
   uses `AC_LANG_PROGRAM` instead.
   
   Tested on both `autoconf-2.69` and `autoconf-2.69d`.
   
   Bug: https://bugs.gentoo.org/738156
   Bug: https://bugs.gentoo.org/750353
   Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

   Sergei Trofimovich committed Jan 15, 2021
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