Fix more warnings in framworks/native/opengl/include

Remove two more visability attributes being applied to typedefs.
The warnings were being hidden by the use of -isystem to include
frameworks/native/opengl/include.

Bug: 31752268
Test: m -j native

Change-Id: Ic6854d934a8d0d03b23e596d5230a6deb69c86bc
1 file changed