- pass supplied FFLAGS to the build

--- makefile.orig	2023-05-24 07:18:35 UTC
+++ makefile
@@ -312,7 +312,7 @@ surf/surf:	src/surf/*.h src/surf/*.c
 
 surf/surf:	src/surf/*.h src/surf/*.c
 	$(MAKE) -C src/surf depend 
-	$(MAKE) -C src/surf EXT="${EXT}"
+	$(MAKE) -C src/surf EXT="${EXT}" FFLAGS="$(FFLAGS)"
 	mv src/surf/surf bin/surf
 
 docker/docker:	docker/*.f docker/*.c