[client] major restructure of platform specific code

client/displayservers/SDL/CMakeLists.txt

@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.0)
+project(displayserver_SDL LANGUAGES C)
+
+#find_package(PkgConfig)
+#pkg_check_modules(DISPLAYSERVER_SDL_PKGCONFIG REQUIRED
+#	#sdl2
+#)
+
+add_library(displayserver_SDL STATIC
+	sdl.c
+)
+
+target_link_libraries(displayserver_SDL
+	${DISPLAYSERVER_SDL_PKGCONFIG_LIBRARIES}
+	${DISPLAYSERVER_SDL_OPT_PKGCONFIG_LIBRARIES}
+	lg_common
+)
+
+target_include_directories(displayserver_SDL
+	PRIVATE
+		src
+		${DISPLAYSERVER_SDL_PKGCONFIG_INCLUDE_DIRS}
+		${DISPLAYSERVER_SDL_OPT_PKGCONFIG_INCLUDE_DIRS}
+)