Drop "no rexgen" log message unless verbosity was bumped.
Posix mmap() for wordlist mode - without dropping the old array buffer.
This gives up to a 3x boost, especially for --fork. The buffer is read
using a function similar to fgetl() but that reads from the memory map
and that works with up to 16 characters at a time.
mmap() fixes for Windows
Disable Kerberos 5 18/23 formats for Cygwin
Blind Windows fix: we should probably munmap() the same size we mapped
for good measure.