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

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

client/renderers/EGL/shader/cursor_mono.frag

@@ -0,0 +1,14 @@
+#version 300 es
+
+in  highp vec2 uv;
+out highp vec4 color;
+
+uniform sampler2D sampler1;
+
+void main()
+{
+  highp vec4 tmp = texture(sampler1, uv);
+  if (tmp.rgb == vec3(0.0, 0.0, 0.0))
+    discard;
+  color = tmp;
+}