Android has no more known uses of SwiftShader's legacy OpenGL ES
implementation. It has been replaced by SwANGLE, the combination of
ANGLE and SwiftShader's Vulkan implementation.

This was tested by aosp/1748769, but this change is meant to be easily
reverted either upstream or downstream in case of unforeseen issues.

Bug: b/147516027
Change-Id: I69cd0605443abd4ace0d08febeb7a53a3032417a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/55308Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Jason Macnak <natsu@google.com>