make.globals: initialize FFLAGS and FCFLAGS

This completes the fixes for bug #349070.
diff --git a/cnf/make.globals b/cnf/make.globals
index 645b7a5..542d6aa 100644
--- a/cnf/make.globals
+++ b/cnf/make.globals
@@ -16,6 +16,8 @@
 CFLAGS=""
 CXXFLAGS=""
 LDFLAGS=""
+FFLAGS=""
+FCFLAGS=""
 
 # Default rsync mirror
 SYNC="rsync://rsync.gentoo.org/gentoo-portage"