Check for mlock()
Also check for VirtualLock()
Add sodium_mlock() and sodium_munlock()
<errno.h> is required in scrypt_platform.h
Pointers for sodium_m[un]lock() do not have to be const
Wait, what, printf(3) on Windows doesn't even support %zu? o_O
Do not compile sse/pwhash_scryptxsalsa208sha256.c unless emmintrin.h is available.