[PATCH] bug fixes for AS_IF and _AC_LANG_COMPILER_GNU

["Jannick" <thirdedition@xxxxxxx>]

Attached bug fix patches for your consideration with changes as small as
possible:

- AS_IF: cope with blank false branch.
- _AC_LANG_COMPILER_GNU: make cached result available to calling macro.

Thanks,
J.

Attachment: 0001-_AC_LANG_COMPILER_GNU-bug-fix-for-cases-when-result-.patch
Description: Binary data

Attachment: 0001-m4sh-AS_IF-add-test-for-AS_IF-with-blank-false-branc.patch
Description: Binary data

Attachment: 0002-m4sh-AS_IF-bug-fix-for-blank-false-branch.patch
Description: Binary data