BeOS and Haiku ports

BeOS and Haiku ports

The BeOS port uses private syscalls exported by libroot.so to implement the intel access methods.
The Haiku port uses ioctls to the /dev/misc/poke device driver (use originally for debugging with
/bin/poke) to implement the intel access methods. BeOS has non-standard arch names, so we map them
to i386 and powerpc in the configure. Updated README and pcilib.man accordingly.

Signed-off-by: François Revol <revol@free.fr>