[client] egl: RGB24 improvements

This patch performs several changes.

* Alters the fourcc codes to types that ignore the alpha channel where
  possible to allow the gpu to internally use 24-bit formats.
* Attempts to use DRM_FORMAT_RGB888 first as some GPUs may support this
* If DMABUF is not in use the data is now imported directly as RGB24
  without the post-processing shader

client/renderers/EGL/framebuffer.c

@@ -72,7 +72,7 @@ bool egl_framebufferSetup(EGL_Framebuffer * this, enum EGL_PixelFormat pixFmt,
   }
 
   GLuint tex;
-  egl_textureGet(this->tex, &tex, NULL, NULL);
+  egl_textureGet(this->tex, &tex, NULL, NULL, NULL);
 
   glBindTexture(GL_TEXTURE_2D, tex);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);