GitLab

Remove options that were valid for pnacl toolchain but are not valid for
mipsel-nacl-clang.
This fixes the build issues:

 mipsel-nacl-clang: error: unsupported option '--pnacl-mips-bias'
 mipsel-nacl-clang: error: unsupported option '--pnacl-allow-translate'

Review URL: https://codereview.chromium.org/1806403002

Cr-Commit-Position: refs/heads/master@{#381801}