opengles emulator: fixing GL_HALF_FLOAT_OES bug

when calculating the data size to pack, the type GL_HALF_FLOAT_OES,
wasn't recognized at all and therefore was by default 0, while it
should be 2 bytes.

Change-Id: Ib1f0dcdb837dd1b9cfebd1090cabfb59de472c53
1 file changed