This enables running dEQP on Linux when it was built against an EGL 1.5
capable driver. Note that this is not a complete EGL 1.5 implementation.

Change-Id: Ie29d9ec61e7e3694eb8862aad7432b77fe7c7bae
Reviewed-on: https://swiftshader-review.googlesource.com/15909Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>