<i18n dev> RFR : 7167359 (tz) SEGV on solaris if TZ variable not set

[Seán Coffey]

review request for issue that arose after 7092679 fix.

Without a TZ variable set on solaris, there's possibility for SEGV.
Simple fix.

webrev : http://cr.openjdk.java.net/~coffeys/webrev.7167359.jdk8/
bug : http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7167359 (not 
visible yet)

regards,
Sean.
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