graphics: Add directives for compatibility with older EGL blobs (1/2)

Port from CM9.
Original author Ricardo Cerqueira (commit
fc496c0607d0d2863ff9587019e890ab806ea49d)

Change-Id: I2789a98a7069d90da30ec1231882b697f2140fce
Add MISSING_EGL_EXTERNAL_IMAGE ifdef to NativeWindowRenderer

Change-Id: I0e9cf6ac1c6da17326525ee1be26a3b3ea9c29e7
Camera Overlay

Change-Id: Id0359d9e7f557b4964a1976bb2906ad96adea7fd