Add a Makefile for OpenWatcom using WMAKE. This is a horrible version
of Make, but since it's bundled with OpenWatcom it is probably better
to stick to it. It has the nice property that it can produce DOS,
Win32 or OS/2 binaries.
This Makefile currently assumes that it is hosted on a system where
pathname separators are backslashes. For cross-compiling using
OpenWatcom on a Linux system it is probably better to write a separate
Makefile using GNU make to invoke Watcom.
Sort the dependency lists generated by "mkdep.pl", to make sure that
re-running "make alldeps" doesn't change anything unless there has
been real dependency changes. The previous version could produce
different output between runs and across platforms.
