Experiment with using mmap() for large RAR blobs.
RAR mmap: Stop using offset, because it's too hard to determine
page size in a portable way. And this has no real drawbacks.
Add debug info to dyna salt compare.
Dynamic salt: Adjust SALT_CMP_SIZE macro, it ended up wrong due
to struct padding.
RAR-opencl: Get up to speed with CPU version (ie. mmap() support).
Dyna salt debug.
Merge pull request #804 from magnumripper/rar-mmap

Rar mmap. We never munmap() yet but it's slightly less important with an mmap.