guitarix2: fix build with current glib

srcpkgs/guitarix2/template

@@ -36,3 +36,11 @@ if [ -n "$CROSS_BUILD" ]; then
 		vsed -i "/features='test_loadable',/d" src/ladspa/wscript
 	}
 fi
+
+post_patch() {
+	# we want to replace all occurrences of always_inline that are not in
+	# brackets or prefixed by _.
+	# defining always_inline as done by default breaks the [[gnu::always_inline]] attribute
+	vsed -e 's/\([^(_]\|^\)always_inline/\1guitarix_always_inline/g' \
+		-i $(grep -rl '[^(_]always_inline' ./)
+}