Ensure that /dev/urandom is a char device.
Update Win32/Win64 build scripts
Have sodium_munlock() zero the buffer before unlocking it.
Remove HAVE_CPUID conditional
Unbreak cpuid check in autoconf
Preliminary build script for Emscripten
Merge branch 'scrypt' of github.com:jedisct1/libsodium into scrypt

* 'scrypt' of github.com:jedisct1/libsodium:
  Ensure that /dev/urandom is a char device.