[tz] iana build failures on Windows

[Manuela Friedrich]

Hello Paul,

recent changes in the sources cause build failures on Windows, see:

nmake /A /D /C /S
makefile(828) :  U1002: syntax error : invalid macro invocation '$'
Stop.

The related change was
https://github.com/eggert/tz/commit/34c4662760df3af2ad9ec0aab5cc3ffba51dde80

Makefile
-                              $(AWK) '/^Link/ {print $$3}' backward | LC_ALL=C sort -cu
+                             $(AWK) '/^Link/ {printf "%.5d %s\n", g, $$3} /^$$/ {g++}' \
+                               backward | LC_ALL=C sort -cu

Can you please recommend a fix for me to test?

Thank you!

Regards
Manuela Friedrich
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