[client] use cmake to generate renderers/fonts/clipboards headers/code

This is in preperation of cmake options to enable/disable various
functionallity.

client/fonts/SDL/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.0)
+project(font_SDL LANGUAGES C)
+
+find_package(PkgConfig)
+pkg_check_modules(FONT_SDL_PKGCONFIG REQUIRED
+	SDL2_ttf
+	fontconfig
+)
+
+add_library(font_SDL STATIC
+	src/sdl.c
+)
+
+target_link_libraries(font_SDL
+	${FONT_SDL_PKGCONFIG_LIBRARIES}
+)
+
+target_include_directories(font_SDL
+	PUBLIC
+		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+		$<INSTALL_INTERFACE:include>
+	PRIVATE
+		src
+		${FONT_SDL_PKGCONFIG_INCLUDE_DIRS}
+)