Suggestion to support encrypted Stdin/Stdout when password provided on command line

[brentl99]

A couple of simple changes to main.c/lrzip.c will allow for compress/decompress via stdin/stdout when the password is provided on the command line. I have implemented this as:
main.c, line 715: if (unlikely((STDIN || STDOUT) && ENCRYPT && !control->passphrase))
lrzip, line 861: if (ENCRYPT && !control->passphrase)