main/weston: disable backend-rdp

aports/main/weston/APKBUILD

 # Forked from Alpine to add patches that make it work with weird framebuffer drivers
 # from downstream kernels
+# "backend-rdp" temporarily disabled, because Alpine's freerdp package doesn't exist
+# for armhf yet and we can't build freerdp with pmbootstrap (#1489)
 pkgname=weston
 pkgver=9999
 _pkgver=3.0.0
-pkgrel=14
+pkgrel=15
 _libname=lib$pkgname
 _libdir=$_libname-${_pkgver%%.*}
 pkgdesc="The reference Wayland server"
@@ -13,12 +15,12 @@ license="MIT"
 depends=""
 makedepends="wayland-protocols libxkbcommon-dev xkeyboard-config
 	libinput-dev libunwind-dev mtdev-dev libxcursor-dev glu-dev
-	pango-dev colord-dev freerdp-dev libwebp-dev libva-dev dbus-dev
+	pango-dev colord-dev libwebp-dev libva-dev dbus-dev
 	linux-pam-dev wayland-dev"
 _cms="cms-colord cms-static"
 _shell="shell-desktop shell-fullscreen shell-ivi"
 _client="info terminal wcap-decode"
-_backend="backend-drm backend-fbdev backend-headless backend-rdp backend-x11 backend-wayland"
+_backend="backend-drm backend-fbdev backend-headless backend-x11 backend-wayland"
 options="!check suid"
 
 for _sub in $_cms $_shell $_client $_backend; do
@@ -50,7 +52,6 @@ build() {
 		--mandir=/usr/share/man \
 		--localstatedir=/var \
 		--libexecdir=/usr/lib/$pkgname \
-		--enable-rdp-compositor \
 		--enable-screen-sharing \
 		--enable-vaapi-recorder \
 		--enable-clients \