sdl2-mixer: add package

Add SDL2 audio mixer and music playback library.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

libs/sdl2-mixer/Makefile

@@ -0,0 +1,54 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=sdl2-mixer
+PKG_VERSION:=2.8.0
+PKG_RELEASE:=1
+
+PKG_SOURCE:=SDL2_mixer-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://codeload.github.com/libsdl-org/SDL_mixer/tar.gz/release-$(PKG_VERSION)?
+PKG_HASH:=1146f00815c8ad22c3d48fbe31ae23dc5997936ebf30b4b3aeab6eab7ea1db3e
+
+PKG_BUILD_DIR:=$(BUILD_DIR)/SDL_mixer-release-$(PKG_VERSION)
+
+PKG_MAINTAINER:=Daniel Golle <daniel@makrotopia.org>
+PKG_LICENSE:=BSD-3c
+PKG_LICENSE_FILES:=COPYING LICENSE
+
+CMAKE_INSTALL:=1
+
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/cmake.mk
+
+CMAKE_BINARY_SUBDIR:=openwrt-build
+
+CMAKE_OPTIONS += \
+	-DSDL2MIXER_MIDI_FLUIDSYNTH_SHARED=ON
+
+define Build/InstallDev
+	$(call Build/InstallDev/cmake,$(1))
+ifdef CONFIG_DEBUG
+	$(LN) libSDL2_mixerd.so $(1)/usr/lib/libSDL2_mixer.so
+endif
+endef
+
+define Package/libsdl2-mixer
+  SECTION:=libs
+  CATEGORY:=Libraries
+  TITLE:=SDL2 Mixer
+  URL:=https://www.libsdl.org/
+  DEPENDS:=+libfluidsynth +libopusfile +libsdl2 +libwavpack +libxmp
+endef
+
+define Package/libsdl2-mixer/description
+  SDL Audio Mixer library
+endef
+
+define Package/libsdl2-mixer/install
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/lib*.so* $(1)/usr/lib/
+ifdef CONFIG_DEBUG
+	$(LN) libSDL2_mixerd.so $(1)/usr/lib/libSDL2_mixer.so
+endif
+endef
+
+$(eval $(call BuildPackage,libsdl2-mixer))