[patch #10452] AX_PROG_CC_FOR_BUILD patches that fix BUILD_{EXE, OBJ}EXT (Autoconf 2.70)

[anonymous]

Follow-up Comment #2, patch #10452 (group autoconf-archive):

Hello.

Not sure if the maintainers are interested in new patches, but I made some
more fixes.

0004-ax_prog_cc_for_build-Fix-ac_cv_prog_cc_c-99-11-regre.patch

This fixes regression where two macros are not restored after
AX_PROG_CC_FOR_BUILD call. Also adjust some code formatting.

0005-ax_prog_cc_for_build-Support-ac_-cv_-build_prog_cc_s.patch

Improve compatibility with Autoconf 2.70 and later by supporting
ac_build_prog_cc_stdc and ac_cv_build_prog_cc_c23.

0006-ax_prog_cc_for_build-Allow-user-override-of-cache-va.patch

This brings back support of user override of cache variables, specifically
ac_cv_build_exeext, ac_cv_build_objext and ac_cv_build_c_compiler_gnu.

(file #56015, file #56016, file #56017)

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Additional Item Attachment:

File name: 0004-ax_prog_cc_for_build-Fix-ac_cv_prog_cc_c-99-11-regre.patch
Size: 3KiB
   
<http://file.savannah.gnu.org/file/0004-ax_prog_cc_for_build-Fix-ac_cv_prog_cc_c-99-11-regre.patch?file_id=56015>

File name: 0006-ax_prog_cc_for_build-Allow-user-override-of-cache-va.patch
Size: 2KiB
   
<http://file.savannah.gnu.org/file/0006-ax_prog_cc_for_build-Allow-user-override-of-cache-va.patch?file_id=56016>

File name: 0005-ax_prog_cc_for_build-Support-ac_-cv_-build_prog_cc_s.patch
Size: 2KiB
   
<http://file.savannah.gnu.org/file/0005-ax_prog_cc_for_build-Support-ac_-cv_-build_prog_cc_s.patch?file_id=56017>


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