[trunk] fail to compile on cygwin

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This should work unless it involves constant data structures referencing
symbols from auto-imported DLLs.strftime.o: In function rb_strftime': /home/suke/work/ruby/bin-cygwin-trunk/../../../../svn/ruby/trunk/strftime.c:489: undefined reference to__imp____daylight’
/home/suke/work/ruby/bin-cygwin-trunk/…/…/…/…/svn/ruby/trunk/strftime.c:459:
undefined reference to `__imp____timezone’
Info: resolving __daylight by linking to __imp___daylight (auto-import)
collect2: ld returned 1 exit status
make: *** [miniruby.exe] Error 1

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