add FFLAGS support so that "gfortran -m32" works on amd64.

Author: mrgtwentythree

compat/m32.mk

@@ -1,4 +1,4 @@
-#	$NetBSD: m32.mk,v 1.2 2011/06/18 01:22:34 mrg Exp $
+#	$NetBSD: m32.mk,v 1.3 2026/01/18 08:33:04 mrg Exp $
 
 #
 # Makefile fragment to help implement a set of 'cc -m32' libraries.
@@ -12,6 +12,7 @@ CPUFLAGS+=		-m32
 LDADD+=			-m32
 LDFLAGS+=		-m32
 MKDEPFLAGS+=		-m32
+FFLAGS+=		-m32
 
 .include "Makefile.compat"