The X11 interface reads file NetHack.ad (after cd'ing to the playground
directory, where 'make install' puts a copy) and feeds the contents to
X Windows for use as default resources to override the compiled in
defaults. When use of #define was introduced into NetHack.ad (back in
September, 2016) this was severely hobbled and startup spit out a lot
complaints to stderr about invalid resource values. This implements
rudimentary macro expansion for '#define name value' within the data
stream that's fed to X, getting back decent default values and
eliminating the invalid value complaints.
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