Remove references to JBMR2+ HAL pixel formats. We don't support them anyway.
Link EGL against LLVM. This happens because there are some dependencies in
the android_top libraries. I suspect it's happening because we link per-file,
not per-function.

Change-Id: Ibc37d3fcbe9967fcffdaa35e07d4cc654c13d46e
Reviewed-on: https://swiftshader-review.googlesource.com/3150Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Greg Hartman <ghartman@google.com>