Port of libsdl, mixer, image, net, ttf

Imported from genode repository

Issue genodelabs/genode#3100

recipes/api/sdl/content.mk

@@ -0,0 +1,27 @@
+MIRROR_FROM_REP_DIR := lib/symbols/sdl lib/import/import-sdl.mk \
+                       lib/mk/mesa_api.mk lib/mk/sdlmain.mk
+
+content: $(MIRROR_FROM_REP_DIR) src/lib/sdl include LICENSE
+
+$(MIRROR_FROM_REP_DIR):
+	$(mirror_from_rep_dir)
+
+SDL_PORT_DIR  := $(call port_dir,$(REP_DIR)/ports/sdl)
+MESA_PORT_DIR := $(call port_dir,$(REP_DIR)/ports/mesa)
+
+#
+# The Mesa header files needed for SDL_OpenGL are copied as well.
+#
+include:
+	mkdir -p $@
+	cp -r $(SDL_PORT_DIR)/include/SDL $@/
+	cp -r $(REP_DIR)/include/SDL $@/
+	cp -r $(MESA_PORT_DIR)/include/* $@/
+	cp -r $(REP_DIR)/include/EGL $@/
+
+src/lib/sdl:
+	mkdir -p $@
+	cp -r $(REP_DIR)/src/lib/sdl/sdl_main.cc $@/
+
+LICENSE:
+	cp $(SDL_PORT_DIR)/src/lib/sdl/COPYING $@

recipes/api/sdl/hash

@@ -0,0 +1 @@
+2018-03-18 2cdaa5c32a93a5acf0ee7159f96e9f01d67ab8d2