[sr #110400] autoconf 2.70 no longer supports clang with -Wextra-semi-stmt warning enabled

Follow-up Comment #3, sr #110400 (project autoconf):

AC_LANG_PROGRAM(C) generates the same empty statement in 2.69.  However, the
"checking how $CC reports undeclared, standard C functions" test is new in
2.70.  It seems to have been added specifically for Clang's sake, in commit
82ef7805faffa151e724aa76c245ec590d174580
<https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=82ef7805faffa151e724aa76c245ec590d174580>.

I don't like the way the logic added in this commit works -- even if we can
find a fix for the specific problem you hit, it seems likely to be trouble in
the future, not only for itself but for other tests.  I added a whole block of
text to NEWS about how "running configure tests with warnings promoted to
errors is not supported" and now I discover we're doing that exact thing
ourselves :-(  Only for AC_CHECK_DECL(S), but still.

I'm not all that familiar with clang.  Does anyone have a better idea for how
to handle this quirk it has?

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