GPU/HW/OpenGLES: Use shader cache

src/core/gpu_hw_opengl_es.h

@@ -2,6 +2,7 @@
 #include "common/gl/program.h"
 #include "common/gl/stream_buffer.h"
 #include "common/gl/texture.h"
+#include "common/gl/shader_cache.h"
 #include "glad.h"
 #include "gpu_hw.h"
 #include <array>
@@ -53,6 +54,8 @@ private:
   void SetDrawState(BatchRenderMode render_mode);
   void SetScissorFromDrawingArea();
 
+  GL::ShaderCache m_shader_cache;
+
   // downsample texture - used for readbacks at >1xIR.
   GL::Texture m_vram_texture;
   GL::Texture m_vram_read_texture;