Add arm specific configuration to help in the port.
Makefile changes to build on ARM
Add fake cpuid for ARM

TODO: proper implementation using procinfo
arm: use LLVM3.5
Rename Make.inc.arm to ARM.inc
Add checksums for llvm 3.5.0
Add basic ARM README
ARM.inc should have lower precedence than Make.user
Reorganize Make.inc to do detection earlier
Merge branch 'arm-make3' of github.com:JuliaLang/julia into arm-make3

Conflicts:
	Make.inc
Update README.arm
arm: don't use system SuiteSparse
Restore the Make.inc to what it was at in a2582d08e1402bcede8c5e023cb26da939a7d2cc
Some FFTW build tweaks.
arm: Revert the changes made to base/constants.jl earlier.
Remove ARM.inc inclusion in Make.inc.
Merge pull request #7662 from JuliaLang/arm-make3

build changes for ARM