test: disable unsupported test for GOARCH=mips{,le}

External linking on mips/mipsle is not supported yet (issue #17792).

Change-Id: Ic25f4f8fe9e0ec35c72ca9f85c053b398df4952c
Reviewed-on: https://go-review.googlesource.com/31512Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

test/fixedbugs/issue10607.go

-// +build linux,!ppc64,!ppc64le
+// +build linux,!mips,!mipsle,!ppc64,!ppc64le
 // run
 
 // Copyright 2015 The Go Authors. All rights reserved.