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

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

client/clipboards/X11/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.0)
+project(clipboard_X11 LANGUAGES C)
+
+find_package(PkgConfig)
+pkg_check_modules(CLIPBOARD_PKGCONFIG REQUIRED
+	x11
+	xfixes
+)
+
+add_library(clipboard_X11 STATIC
+	src/x11.c
+)
+
+target_link_libraries(clipboard_X11
+	${CLIPBOARD_PKGCONFIG_LIBRARIES}
+)
+
+target_include_directories(clipboard_X11
+	PUBLIC
+		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+		$<INSTALL_INTERFACE:include>
+	PRIVATE
+		src
+		${CLIPBOARD_PKGCONFIG_INCLUDE_DIRS}
+)