PR bootstrap/30753
	* configure.ac: Remove obsolete build / host tests.  Use AC_PROG_CC
	unconditionally.  Use AC_PROG_CXX.  Use ACX_TOOL_DIRS to find $prefix.
	* configure: Regenerated.

Co-Authored-By: Paolo Bonzini <bonzini@gnu.org>

From-SVN: r121882