(MOSTLYCLEANFILES): Added paths.h.

(AM_CPPFLAGS): Removed the DEFAULT_PREFIX define.  Use paths.h instead.
(sbin_PROGRAMS): Was: bin_PROGRAMS.
(BUILT_SOURCES): Added paths.h.
(.gdbinit): Removed redundant "-f" option to $(RM).
(DEFP): New constant.
(paths.h): New target.
(server-config.o): Added explicit dependency on paths.h.