Remove symbols not available on Android

Change-Id: I35296240662157fb4d0172fd386d82ab038634ca
Reviewed-on: https://swiftshader-review.googlesource.com/2668
Tested-by: Greg Hartman <ghartman@google.com>
Reviewed-by: Greg Hartman <ghartman@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>