Revert upstream commit about export_packages for generate_gir; there is

no corresponding versioned pkgconfig file which break Gir generation
for graphics/libmypaint.

graphics/babl/Makefile

@@ -3,6 +3,7 @@ COMMENT=		dynamic pixel format conversion library
 V=			0.1.96
 DISTNAME=		babl-${V}
 EXTRACT_SUFX=		.tar.xz
+REVISION=		0
 
 API_VERSION=		${V:R}
 SUBST_VARS=		API_VERSION

graphics/babl/patches/patch-babl_meson_build

@@ -0,0 +1,23 @@
+REVERT:
+From 1cd557ce6873b08e66e0434a5ff8b2a2faa97f7b Mon Sep 17 00:00:00 2001
+From: Lukas Oberhuber <lukaso@gmail.com>
+Date: Tue, 5 Jul 2022 15:07:34 +0000
+Subject: [PATCH] meson: fix export_packages for generate_gir
+
+This commit broke graphics/libmypaint Gir generation with:
+Package babl-0.1 was not found in the pkg-config search path
+(there is no lib/pkgconfig/babl-0.1.pc, only babl.pc)
+
+https://gitlab.gnome.org/GNOME/babl/-/issues/80
+
+Index: babl/meson.build
+--- babl/meson.build.orig
++++ babl/meson.build
+@@ -156,7 +156,6 @@ if build_gir
+     namespace: 'Babl',
+     nsversion: api_version,
+     header: 'babl.h',
+-    export_packages: 'babl-0.1',
+     install: true,
+   )
+