libgtk3: remove non-existent configure options

>From config.log:

configure: WARNING: unrecognized options: --disable-doc, --disable-docs,
--disable-documentation, --with-xmlto, --with-fop, --enable-ipv6,
--enable-gtk2-dependency, --disable-introspection

Remove non-existent --enable-gtk2-dependency and --disable-introspection
configure options from libgtk3.mk.

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libgtk3/libgtk3.mk

@@ -20,9 +20,7 @@ LIBGTK3_CONF_ENV = \
 
 LIBGTK3_CONF_OPTS = \
 	--disable-glibtest \
-	--enable-explicit-deps=no \
-	--enable-gtk2-dependency \
-	--disable-introspection
+	--enable-explicit-deps=no
 
 # Override pkg-config pkgdatadir variable, it needs the prefix
 LIBGTK3_MAKE_OPTS = \