* ltcf-cxx.sh (ac_cv_prog_cc_pic_works, ac_cv_prog_cc_static_works):

	Don't unset, it's non-portable and no longer necessary, set to empty
	instead.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@39300 138bc75d-0d04-0410-961f-82ee72b054a4