configure.in: Clean up handling of --enable-version-specific-runtime-libs and related...

configure.in: Clean up handling of --enable-version-specific-runtime-libs and related...

	* configure.in: Clean up handling of
	--enable-version-specific-runtime-libs and related variables;
	replace 'if test' with 'case' where reasonable.  Fix comments.
	Remove useless libstdcxx_interface.
	* configure: Regenerate.

	* configure.in: Use _GCC_TOPLEV_NONCANONICAL_TARGET.
	Replace uses of target_alias with target_noncanonical.
	* aclocal.m4: Include ../config/acx.m4.
	* configure: Regenerate.
	* Makefile.in: Replace uses of target_alias with target_noncanonical.
	Fix copyright statement.

	* configure.in: Hand-inline bulky, confusing macros from
	aclocal.m4.  Replace references to "GNU Objective C" with "GCC".
	Update copyright notice.  Remove stuff for automake, which isn't
	used in this directory.  Remove emacs local variables.
	* aclocal.m4: Remove hand-inlined macros.  Update copyright notice.
	* configure: Regenerate.

From-SVN: r80546