Revert "libagl: Allow use of copybit to accelerate 2D rendering"

This reverts commit df180c4aa80f2945040d56366d5306515c636e79.

Conflicts:
	opengl/libagl/Android.mk
libEGL: allow devices to workaround Google bug 10194508

Most older blobs don't have the EGL_KHR_gl_colorspace
extension and need this workaround.

Change-Id: Ifc5d097c1a0b68275d23c2d191976ac96631b695

Conflicts:
	opengl/libs/Android.mk