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

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

client/renderers/OpenGL/CMakeLists.txt

@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.0)
+project(renderer_Opengl LANGUAGES C)
+
+find_package(PkgConfig)
+pkg_check_modules(RENDERER_OPENGL_PKGCONFIG REQUIRED
+	gl
+	glu
+)
+
+add_library(renderer_OpenGL STATIC
+	opengl.c
+)
+
+target_link_libraries(renderer_OpenGL
+	${RENDERER_OPENGL_PKGCONFIG_LIBRARIES}
+	decoders
+	fonts
+)
+
+target_include_directories(renderer_OpenGL
+	PRIVATE
+		src
+		${RENDERER_OPENGL_PKGCONFIG_INCLUDE_DIRS}
+)