dev-cpp/gstreamermm: drop RDEPEND dev-cpp/libxmlpp

This dependency has been dropped since upstream commit[1] and is no
longer required.

[1] 91902f6226

Closes: https://bugs.gentoo.org/813013
Signed-off-by: 1vybridge <openrc@posteo.de>
Part-of: https://github.com/gentoo/gentoo/pull/42629
Closes: https://github.com/gentoo/gentoo/pull/42629
Signed-off-by: Sam James <sam@gentoo.org>

dev-cpp/gstreamermm/gstreamermm-1.10.0-r3.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -18,7 +18,6 @@ RDEPEND="
 	>=media-libs/gstreamer-${PV}:1.0
 	>=media-libs/gst-plugins-base-${PV}:1.0
 	>=dev-cpp/glibmm-2.47.6:2
-	>=dev-cpp/libxmlpp-2.14:2.6
 	>=dev-libs/libsigc++-2:2"
 DEPEND="${RDEPEND}
 	test? (