LibAccelGfx: Compile all needed shaders during Painter construction

Instead of recompiling shaders on each paint command call we can
compile them once.

Userland/Libraries/LibAccelGfx/CMakeLists.txt

@@ -5,6 +5,7 @@ if (HAS_ACCELERATED_GRAPHICS)
         Canvas.cpp
         Context.cpp
         Painter.cpp
+        Program.cpp
     )
 
     serenity_lib(LibAccelGfx accelgfx)