contribs: Add libvlcpp rule

contribs/src/libvlcpp/rules.mak

+LIBVLCPP_VERSION := master
+LIBVLCPP_URL := https://code.videolan.org/videolan/libvlcpp.git
+
+PKGS += libvlcpp
+ifeq ($(call need_pkg,"libvlcpp"),)
+PKGS_FOUND += libvlcpp
+endif
+
+$(TARBALLS)/libvlcpp-$(LIBVLCPP_VERSION).tar.xz:
+	$(call download_git,$(LIBVLCPP_URL),,$(LIBVLCPP_VERSION))
+
+libvlcpp: libvlcpp-$(LIBVLCPP_VERSION).tar.xz
+	$(UNPACK)
+	$(MOVE)
+
+.libvlcpp: libvlcpp
+	$(RECONF)
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF)
+	cd $< && $(MAKE) install
+	touch $@
+	
+