[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/desktop_yuv.frag

@@ -0,0 +1,27 @@
+#version 300 es
+
+in  highp vec2 uv;
+out highp vec4 color;
+
+uniform sampler2D sampler1;
+uniform sampler2D sampler2;
+uniform sampler2D sampler3;
+
+void main()
+{
+  highp vec4 yuv = vec4(
+    texture(sampler1, uv).r,
+    texture(sampler2, uv).r,
+    texture(sampler3, uv).r,
+    1.0
+  );
+  
+  highp mat4 yuv_to_rgb = mat4(
+    1.0,  0.0  ,  1.402, -0.701,
+    1.0, -0.344, -0.714,  0.529,
+    1.0,  1.772,  0.0  , -0.886,
+    1.0,  1.0  ,  1.0  ,  1.0
+  );
+  
+  color = yuv * yuv_to_rgb;
+}