* configure.in (AC_EXEEXT): Work around in case it expands to

nothing, as in autoconf 2.50.
* acinclude.m4: Likewise.
* aclocal.m4, configure: Rebuilt.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@43107 138bc75d-0d04-0410-961f-82ee72b054a4