[libstdc++] Cleanup build system [13/13]

[Benjamin Kosnik]

> 2005-04-08  Kelley Cook  <kcook@gcc.gnu.org>
> 
> 	* linkage.m4 (GLIBCXX_MAYBE_UNDERSCORED_FUNCS): New macro.
> 	(GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1,
> 	GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_2,
> 	GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_3,
> 	GLIBCXX_CHECK_MATH_DECLS_AND_LINKAGES_1,
> 	GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_2): Use it.
> 	(GLIBCXX_CHECK_MATH_SUPPORT): Delete obsolete comment.
> 	* acconfig.h: Delete file.
> 	* Makefile.in, config.h.in, configure: Regenerate.

Looks good. Yay!

-benjamin