Merge branch 'fix-gnulib' of /home/nbowler/projects/cdecl99

Import the fix-gnulib history from cdecl99.

* 'fix-gnulib' of /home/nbowler/projects/cdecl99:
  Better document fix-gnulib.
  Make fix-gnulib only need a single output file.
  Simplify glconfig include mechanism.
  Mangle spliced makefile lines in Gnulib correctly.
  Avoid gratuitous library dependencies linking gnulib.
  Rewrite Gnulib symbols to be in libcdecl's namespace.
  Split gnulib_headers into 3 variables.
  Move all Gnulib CLEANFILES variables to the end of the makefile.
  Handle gl_LIBOBJS/gl_LTLIBOBJS correctly.
  Eliminate use of BUILT_SOURCES from Gnulib.
  Integrate Gnulib non-recursively.