egl: Fix call to eglBindAPI for WAFFLE_OPENGL_ES3
egl: Fix call to eglBindAPI for WAFFLE_OPENGL_ES3

The switch statement which translated WAFFLE_OPENGL_$API to
EGL_OPENGL*_API lacked a case for WAFFLE_OPENGL_ES3.

This codepath, which is part of waffle_context_create(),  was never
exercised until recently because eglChooseConfig(EGL_OPENGL_ES3_BIT_KHR)
failed against Mesa.

Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

dcbaker/waffle,dcbaker/waffle,dcbaker/waffle,chadversary/waffle,waffle-gl/waffle,evelikov/waffle,chadversary/waffle,fjhenigman/waffle,janesma/waffle,evelikov/waffle,yinquan529/waffle-gl-waffle,fjhenigman/waffle,fjhenigman/waffle,yinquan529/waffle-gl-waffle,evelikov/waffle,waffle-gl/waffle,waffle-gl/waffle,chadversary/waffle,janesma/waffle,yinquan529/waffle-gl-waffle,janesma/waffle,maurossi/waffle,maurossi/waffle,maurossi/waffle,waffle-gl/waffle