WIP: build changes for ARM

This currently compiles but does not bootstrap due to jl_cpuid. I was able to stub that out before, but I think it is more deeply entangled now.

See Makefile.user.fake for other options used.

- note DYNAMIC_ARCH=0
- edit openblas-.../c_check.c and remove the -m32 compiler option, as this appears to be unsupported by the arm GCC build (at least with Ubuntu 12.04. there are some suggestions to install g++-4.8.1-multilib, but that did not help me)

See [here](https://gist.github.com/ihnorton/0d475ddda80a3d82c982) for all of the packages I have installed.
is mpfr broken on arm or something?