[MIPS] Allow united mipsel and mips64el gcc toolchain

Explicitly tell 32-bit links that they are doing 32-bit links.
This is needed when using united 32-bit and 64-bit toolchains.
This is harmless when using older separate 32-only toolchains.

Change-Id: I70cbd3f5867e59b1f6f829793444242fb0894aa6
1 file changed