gtk+3: enable native/nativesdk variant

Host-assisted GL in Qemu in theory works with both SDL
and GTK; in practice SDL shows an empty screen. This
prepares the switchover of graphical qemu to use
native gtk, which also provides a neat set of menus to
control the emulator.

(From OE-Core rev: 67819a4d88b7f54b3645628865cbd44376c5d1a7)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-gnome/gtk+/gtk+3.inc

@@ -12,6 +12,10 @@ LICENSE = "LGPLv2 & LGPLv2+ & LGPLv2.1+"
 
 inherit autotools gettext pkgconfig gtk-doc update-alternatives gtk-immodules-cache gsettings distro_features_check gobject-introspection
 
+BBCLASSEXTEND = "native nativesdk"
+
+GSETTINGS_PACKAGE_class-native = ""
+
 # versions >= 3.90 are development versions, otherwise like upstream-version-is-even
 UPSTREAM_CHECK_REGEX = "[^\d\.](?P<pver>3\.([1-8]?[02468])+(\.\d+)+)\.tar"
 
@@ -51,14 +55,27 @@ PACKAGECONFIG[glx] = "--enable-glx,--disable-glx,,libgl"
 PACKAGECONFIG[wayland] = "--enable-wayland-backend,--disable-wayland-backend,wayland wayland-protocols libxkbcommon virtual/mesa wayland-native"
 PACKAGECONFIG[cups] = "--enable-cups,--disable-cups,cups"
 
-do_install_append() {
-	mv ${D}${bindir}/gtk-update-icon-cache ${D}${bindir}/gtk-update-icon-cache-3.0
+prepare_gtk_scripts() {
+    mv ${D}${bindir}/gtk-update-icon-cache ${D}${bindir}/gtk-update-icon-cache-3.0
 
     # duplicate gtk-query-immodules for post install script update_gtk_immodules_cache
     mkdir -p ${D}${libexecdir}
     ln ${D}${bindir}/gtk-query-immodules-3.0 ${D}${libexecdir}/${MLPREFIX}gtk-query-immodules-3.0
 }
 
+do_install_append_class-target() {
+    prepare_gtk_scripts
+}
+
+do_install_append_class-nativesdk() {
+    prepare_gtk_scripts
+}
+
+do_install_append_class-native() {
+    # provided by gtk-icon-utils-native
+    rm ${D}${bindir}/gtk-encode-symbolic-svg
+}
+
 PACKAGES =+ "${PN}-demo"
 LIBV = "3.0.0"
 
@@ -104,6 +121,10 @@ GTKBASE_RRECOMMENDS ?= "liberation-fonts \
                         shared-mime-info \
                         adwaita-icon-theme-symbolic \
                         "
+
+GTKBASE_RRECOMMENDS_class-native ?= "\
+                        "
+
 GTKGLIBC_RRECOMMENDS ?= "${GTKBASE_RRECOMMENDS} glibc-gconv-iso8859-1"
 
 RRECOMMENDS_${PN} = "${GTKBASE_RRECOMMENDS}"