[Orgmode] Build error with Emacs 21

[Michael Ekstrand]

At school, we have Emacs 21.4.1, and I got the following error trying to
build org-mode from git:

> While compiling toplevel forms in file org-mode/lisp/org-clock.el:
>   !! Symbol's function definition is void ((define-obsolete-function-alias))

So, in the format indicated in the manual:

1. I typed `make` in the root of a clean checkout of org-mode from git
   (well, via git-cvsserver, since I don't have unlimited disk quota at
   school).
2. I expected it to compile successfully.
3. It failed with the error message above.

Emacs version is 21.4.1.  OS is Ubuntu 6.06.

- Michael

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