Fcntl - load the C Fcntl.h defines
This module is just a translation of the C fnctl.h file.
Unlike the old mechanism of requiring a translated fnctl.ph
file, this uses the h2xs program (see the Perl source distribution)
and your native C compiler. This means that it has a
far more likely chance of getting the numbers right.
#define symbols get translated; you must still correctly
pack up your own arguments to pass as args for locking functions, etc.