More reasonable fallback for self path.

* Makefile (opt/txr.o, dbg/txr.o): Set up TXR_REL_PATH
preprocessor symbol on command line which specifies the
hard installation path derived from the configure prefix.

* txr.c (get_self_path): The fallback implementation simply
returns TXR_REL_PATH. This will work if in fact the executable
is installed at that path. What it means is that the build of
TXR which uses this fallback get_self_path will not support
relocation: the installation cannot be moved to another
directory, yet still find its supporting files.  This is
better than what we are replacing: not working even in the
original installation directory, if not invoked by an absolute
path.

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