[PATCH v3] tzset robustness [BZ#17715]

[Florian Weimer]

This patch increases tzset robustness in various ways.   Large timezone
specifiers in the environment variable and in files are rejected, and
various file corruptions are now detected.

This patch does not include the controversial TZ scrubbing feature I
proposed.

Tested on x86_65-redhat-linux-gnu, no regressions.  (Earlier testing was
also done on i386-redhat-linux-gnu.)

-- 
Florian Weimer / Red Hat Product Security
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