[racket-dev] Racket fails to build w/o places

I think this commit broke building without places support:
http://git.racket-lang.org/plt/commitdiff/d6bfd0688a471fc814e3c363a96cd67d4bdfb7c9
since `mz_proc_thread_self()` is declared in mzrt.c only when
MZ_UZE_MZRT is defined. Thus we cannot use it in sighand.c without
checking if it's available first.

The attached patch should fix the problem.

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Happy Hacking.

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