to disable strict aliasing on HP-UX C/aC++, `+Otype_safety=off` is right. `+Otype_safety=strong` forces ANSI aliasing.
This moves the compatibility include files from include to include/compat so we can use the awful MS C compiler <../include/> trick to emulate the GNU #include_next extension. This also removes a few old compat files we do not need anymore.
this allows for some reusability with libtls