PR bootstrap/42424
	* configure.ac: Include libtool m4 files.
        (_LT_CHECK_OBJDIR): Call it.
	(extra_mpc_mpfr_configure_flags, extra_mpc_gmp_configure_flags,
	gmplibs, ppllibs, clooglibs): Use $lt_cv_objdir.
	
	* configure: Regenerate.



Co-Authored-By: Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>

From-SVN: r155712