[sparc64] Fix build of x11/i3status

x11/i3status uses C11 constructs so base-gcc arches must use ports-gcc.

This diff fixes the build for sparc64

ok?

(cc MAINTINER)

--Kurt

Index: Makefile
===================================================================
RCS file: /cvs/ports/x11/i3status/Makefile,v
retrieving revision 1.63
diff -u -p -r1.63 Makefile
--- Makefile 6 Dec 2021 09:51:28 -0000 1.63
+++ Makefile 27 Dec 2021 20:31:30 -0000
@@ -17,6 +17,10 @@ PERMIT_PACKAGE = Yes
MASTER_SITES= ${HOMEPAGE}
EXTRACT_SUFX= .tar.xz

+# C11
+COMPILER= base-clang ports-gcc
+COMPILER_LANGS= c
+
WANTLIB += c confuse yajl sndio

MODULES= devel/meson