Separate the compiler flags used for compiling X11 code from the rest
of CFLAGS. Affects hints/macosx10.8 and later.
Add an explicit output argument to the generated compile rules.
The change to Makefile.src for X11+XPM on linux broke linking X11 on
OSX. This updates the hints files (except for the -qt one) so that
make WANT_WIN_X11=1
and
make WANT_WIN_X11=1 USE_XPM=1
work correctly.
The comment in macosx10.14 about what version(s) it's intended for
and been tested on is just cloned from 10.10 and should be updated.
On OSX, one of the XQuartz header files triggers a compiler warning
about using a gcc extension, resulting in a diagnostic for each of
the files compiled with the WANT_WIN_X11 set of CFLAGS. Use the
same fix as hints/macosx10.8 already does.
This makes installing NetHack on a public server much easier.
Required some minor changes to the unix top-level Makefile, and
the other hints files; Makefile variable HACKDIR may not be a
full path anymore, use INSTDIR instead.
