[tz] iana build failures on Windows

[Paul Eggert]

After some more searching on the net, I found this page quoting a 
30-year-old Microsoft Programmers Library manual:

https://www.pcjs.org/documents/books/mspl13/c/qctools/

It says, for fatal error message U1002, that "To use a dollar sign in 
the file, type it twice ($$) or precede it with a caret (^)." The 
"caret" part contradicts POSIX but sounds like the problem you ran into.

The tzdb Makefile has three other instances of "^$" but they're all 
followed by "s" and I guess nmake doesn't mind that, though it 
misinterprets the definitions in question. Since you're not running the 
checks (which are the only rules using those other instances) we won't 
worry about them.

Does the attached patch work around the nmake bug? If so, it may be 
better than my previous suggestions.
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