current version from CVS fails build

[Fred Fish]

For the last few days, the latest version from the CVS repository has been
failing to build for me.  The error is:

  make[2]: Entering directory `/links/build/sourceware/gdb/T-i686-pc-linux-gnu/tix/unix'
  /bin/sh: line 1: cd: tk8.4: No such file or directory

This is coming from the following in tix/unix/Makefile:

  # CYGNUS LOCAL: Just recur for most targets:

  SUBDIR = tk8.4

  all test:
        @cd $(SUBDIR) && $(MAKE) $@

and there is no tk8.4 subdir.

-Fred