Fcntl implementation (mimicking Perl 5)

For this module, I'm trying to give you a module which has the native definitions for constants for a given OS, generated from C headers but available in a pure Perl 6 module. In order to do this, I've written a very small C program which appends Perl 6 code to a template, and then that's what you use. I've also written a small test program that allows me to verify the values are what C thinks they should be when I send them back in.

For more details, read the POD.