Remove config/libtool-sun-fortran.diff line from Makefile.am, since it was deleted.

This commit was SVN r24081.

config/Makefile.am

@@ -24,7 +24,6 @@ EXTRA_DIST = \
 	opal_get_version.m4sh \
 	libltdl-preopen-error.diff \
 	ltmain_pgi_tp.diff \
-	libtool-sun-fortran.diff \
         ompi_mca_priority_sort.pl
 
 maintainer-clean-local: