Fix sizing error in memset() call
Remove various unused variables

GCC 4.8 warns about them, and they seem to be entirely
unused.
Add support for AArch64

Add a new CPU Arch Type, AArch64, and properly
parse the /proc/cpuinfo (that is quite similar to ARM 32bit)
Merge pull request #1 from dirkmueller/aarch64

AArch64 support