dashboard: don't test-compile mips32 yet
dashboard: don't test-compile mips32 yet

Change-Id: Id24f8dce9fcadb91747a97d6db17c90bd61ecbb4
Reviewed-on: https://go-review.googlesource.com/33155
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/build,golang/build,golang/build,golang/build