security/nacl added
Add randombytes.o to the libnacl.a archive

reference:
https://github.com/mxcl/homebrew/blob/master/Library/Formula/nacl.rb
Add -fPIC
Remove some implementations that do not want to be relocatable

reference: https://gist.github.com/4437587
lowercase
New header
Bump PORTREVISION in nacl