emulator/opengl: Fix eglWaitGL implementation.

The eglWaitEGL implementation didn't restore the previous
bound API after calling eglWaitClient. This probably isn't
a big concern for emugl correctness, but fixing this removes
a compiler warning.

See http://www.khronos.org/registry/egl/sdk/docs/man/xhtml/eglWaitGL.html

Change-Id: I143ffeeefa01aff502d27d4e1d6f892f0d1efe5b
1 file changed