libmatroska: remove

Since gerbera was removed, this is unused.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/libmatroska/Makefile

@@ -1,47 +0,0 @@
-#
-# This is free software, licensed under the GNU General Public License v2.
-# See /LICENSE for more information.
-#
-
-include $(TOPDIR)/rules.mk
-
-PKG_NAME:=libmatroska
-PKG_VERSION:=1.6.3
-PKG_RELEASE:=$(AUTORELEASE)
-
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=https://codeload.github.com/Matroska-Org/libmatroska/tar.gz/release-$(PKG_VERSION)?
-PKG_HASH:=0c8c875ae26ac69a722f7fd0f4a4fecb4fdff681f2a165f09c06a40cbf1d0de6
-PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-release-$(PKG_VERSION)
-
-PKG_MAINTAINER:=
-PKG_LICENSE:=LGPL-2.1-or-later
-PKG_LICENSE_FILES:=LICENSE.LGPL
-
-CMAKE_INSTALL:=1
-PKG_BUILD_DEPENDS:=libebml
-
-include $(INCLUDE_DIR)/package.mk
-include $(INCLUDE_DIR)/cmake.mk
-
-define Package/libmatroska
-  SECTION:=libs
-  CATEGORY:=Libraries
-  TITLE:=a C++ libary to parse Matroska files (.mkv and .mka)
-  URL:=https://github.com/Matroska-Org/libmatroska
-  DEPENDS:=+libstdcpp
-  BUILDONLY:=1
-endef
-
-define Package/libmatroska/description
-  a C++ libary to parse and create Matroska files
-endef
-
-CMAKE_OPTIONS += \
-	-DCMAKE_LINK_WHAT_YOU_USE=ON \
-	-DDISABLE_PKGCONFIG=OFF \
-	-DDISABLE_CMAKE_CONFIG=OFF
-
-TARGET_LDFLAGS += -Wl,--gc-sections
-
-$(eval $(call BuildPackage,libmatroska))