Log Message:
Update to 0.4.5. From csosstudy in PR 48336.

* Version 0.4.5
 - Restore compatibility with OSX <= 10.6

* Version 0.4.4
 - Visual Studio is officially supported (VC 2010 & VC 2013)
 - mingw64 is now supported
 - big-endian architectures are now supported as well
 - The donna_c64 implementation of curve25519_donna_c64 now handles
non-canonical points like the ref implementation
 - Missing scalarmult_curve25519 and stream_salsa20 constants are now exported
 - A crypto_onetimeauth_poly1305_ref() wrapper has been added