Another port using -std=gnu11 which needs ports-gcc

I think this time the order is right :)
-- 
:wq Claudio

Index: Makefile
===================================================================
RCS file: /cvs/ports/net/gssdp/Makefile,v
diff -u -p -r1.59 Makefile
--- Makefile	29 Jun 2025 07:37:02 -0000	1.59
+++ Makefile	17 Nov 2025 13:49:17 -0000
@@ -12,6 +12,10 @@ MAINTAINER=		Antoine Jacoutot <ajacoutot
 # LGPLv2
 PERMIT_PACKAGE=	Yes
 
+# -std=gnu11
+COMPILER=		base-clang ports-gcc
+COMPILER_LANGS=		c
+
 WANTLIB += c gio-2.0 glib-2.0 gobject-2.0 gtk-4 intl soup-3.0
 
 MODULES=		devel/meson \