libgfortran does not respect --disable-werror

https://bugs.gentoo.org/433435
http://gcc.gnu.org/PR54724


--- a/libgfortran/configure.ac
+++ b/libgfortran/configure.ac
@@ -140,3 +140,3 @@ AM_PROG_CC_C_O
 if test "x$GCC" = "xyes"; then
-  AM_FCFLAGS="-I . -Wall -Werror -fimplicit-none -fno-repack-arrays -fno-underscoring"
+  AM_FCFLAGS="-I . -Wall -fimplicit-none -fno-repack-arrays -fno-underscoring"
   ## We like to use C11 and C99 routines when available.  This makes
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -5764,3 +5764,3 @@ fi
 # Add -Wall -fno-repack-arrays -fno-underscoring if we are using GCC.
 if test "x$GCC" = "xyes"; then
-  AM_FCFLAGS="-I . -Wall -Werror -fimplicit-none -fno-repack-arrays -fno-underscoring"
+  AM_FCFLAGS="-I . -Wall -fimplicit-none -fno-repack-arrays -fno-underscoring"