community/ucl: hackfix GCC 14 build by injecting stddef.h in CFLAGS

community/ucl/APKBUILD

@@ -20,6 +20,7 @@ prepare() {
 }
 
 build() {
+	export CFLAGS="$CFLAGS -std=gnu99 -fPIC -include stddef.h"
 	./configure \
 		--prefix=/usr \
 		--enable-shared \