[client] project restructure part 1/2

client/renderers/opengl/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.6)
+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}
+)
+
+target_include_directories(renderer_opengl
+	PRIVATE
+		src
+		${RENDERER_OPENGL_PKGCONFIG_INCLUDE_DIRS}
+)