mime: look up mime types on Arch Linux
Some systems use "httpd" directory structure instead of "apache"
Change-Id: I77600baf356f0c0c3359b331505b0426112daebb
GitHub-Last-Rev:
c64766f88cc28899d3d387e3eebfa4fcc3eef808
GitHub-Pull-Request: golang/go#39416
Reviewed-on: https://go-review.googlesource.com/c/go/+/236677
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>