allow to easily test if the OS is UNIX-like

Only on UNIX-like OSes are __unix__ & __unix predefined, so it's needed
to easily test if the OS is UNIX-like or not.

Let's do this cheaply by moving all the define of UNIX-like OSes
after the define for 'generic UNIX': OS_UNIX.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
1 file changed