emulator opengl: system GLESv1 first commit.

This is the first commit for the GLESv1 implementation.
It also includes needed fixes in emugen to support const types.
Also, changed glFinish definition in gl.in to match the
definition as in gl.h.

Change-Id: I90262a1db6035a90af8db17984acecef6499847a

tools/emulator/opengl/tests/ut_renderer/RendererContext.h

@@ -51,7 +51,7 @@ public:
     }
     bool isTex2DEnable(int texunit) { return m_tex2DEnable[texunit]; }
     GLuint getTex2DBind();
-    void addPendingCropRect(int *rect);
+    void addPendingCropRect(const int *rect);
     PendingCropRectSet &getPendingCropRects() { return m_pendingCropRects; }
 
     void setClientActiveTexture(GLenum texture) { m_clientActiveTexture = texture - GL_TEXTURE0; }