EGL_ANGLE_iosurface_client_buffer added a new attribute to the config:
EGL_BIND_TO_TEXTURE_TARGET_ANGLE, which needed to be properly exposed
in the EGL frontend.

Bug: chromium:1015454
Change-Id: I58881df18d711ed7974a0a06e53fed42b1f28638
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41709
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>