Add libtool patch.

Makefile.am

@@ -65,6 +65,8 @@ EXTRA_DIST = util/add-f90-module \
 	contrib/04ltmain-xlinker-patch/ltmain-xlinker-patch.patch \
 	contrib/05macos-nagfor-patch/macos-nagfor.patch \
 	contrib/06ltmain_nag_pthread-patch/ltmain_nag_pthread.patch \
+	contrib/07ltmain-early-xcompile-patch/README \
+	contrib/07ltmain-early-xcompile-patch/ltmain-early-xcompile-libtool-2.4.6.patch \
 	LICENSE
 
 ACLOCAL_AMFLAGS=-I m4

contrib/07ltmain-early-xcompile-patch/README

+This patch fixes a bug in libtool that leads to a fault when
+-Xcompiler is used as first option of compiler flag variables like
+CFLAGS and FCLAGS.

contrib/07ltmain-early-xcompile-patch/ltmain-early-xcompile-libtool-2.4.6.patch

+--- a/config/ltmain.sh
++++ b/config/ltmain.sh
+@@ -3300,7 +3300,8 @@ func_mode_compile ()
+       case $arg_mode in
+       arg  )
+ 	# do not "continue".  Instead, add this to base_compile
+-	lastarg=$arg
++	lastarg=$srcfile
++	srcfile=$arg
+ 	arg_mode=normal
+ 	;;
+ 

scripts/checklicense.exclusions

@@ -31,6 +31,7 @@
 ^contrib/04ltmain-xlinker-patch/.*\.patch$
 ^contrib/05macos-nagfor-patch/.*\.patch$
 ^contrib/06ltmain_nag_pthread-patch/.*\.patch$
+^contrib/07ltmain-early-xcompile-patch/.*\.patch$
 ^contrib/libtool-patch-gen.sh$
 ^contrib/.*/README\.txt$
 ^contrib/.*/README$