[tz] zdump bug?

[Paul Eggert]

On 10/28/18 9:23 PM, Paul Eggert wrote:
> 'zdump New_York' is treated differently from 'zdump ./New_York'. It 
> might make sense for the code to try harder to treat only ".." 
> components differently.

I installed the attached first patch to try to do that. The second 
attached patch silences a warning when running "make 
CFLAGS='$(GCC_DEBUG_FLAGS)' GCC_INSTRUMENT=" on my platform (I updated 
GCC recently).

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