Cleanup unused parts of configure.ac

[Vincent Béron]

configure.ac tested for some things which are not then re-used in Wine's
code. We might as well reduce what's checked for.

I also noticed 5 defines in config.h which are not used to check if
something is there, even if it's used:
HAVE_SENDMSG (AC_CHECK_FUNCS)
HAVE_TCGETATTR (AC_CHECK_FUNCS)
HAVE_WAIT4 (AC_CHECK_FUNCS)
HAVE_WAITPID (AC_CHECK_FUNCS)
HAVE_STRUCT_STAT_ST_BLOCKS (AC_CHECK_MEMBERS)

I guess we should protect such usage (since we know they're not
available everywhere because there's a configure test for them).


Changelog:
Remove unused tests from configure.ac.

Run autoheader and autoconf after applying.

Vincent
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