fix SSP build

Author: zoulasc

external/gpl3/gcc/usr.bin/gfortran/Makefile

@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.2 2026/01/19 03:03:55 mrg Exp $
+#	$NetBSD: Makefile,v 1.3 2026/01/21 12:12:15 christos Exp $
 
 PROG=		gfortran
 SRCS=		${G_GFORTRAN_D_OBJS:.o=.cc}
@@ -15,4 +15,6 @@ ${SRCS}: ${GCCARCH}/defs.mk
 
 .include <bsd.info.mk>
 
+COPTS.gcc.cc += -Wno-error=stack-protector
+
 .PATH: ${DIST}/gcc ${DIST}/gcc/doc ${DIST}/gcc/fortran