rm mips64el build configs

We don't have a way to test this.

Change-Id: Ifef013eb22b4393d3ea7fc7558a2b0064b81ff23
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/290805
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
4 files changed