[tz] CRLF terminated leap-seconds.list fix

[Chris Woodbury]

NIST has yet again generated a leap-seconds.list file
with CRLF line terminations.  If the file is transferred in FTP 
binary mode and used, it breaks leapseconds.awk.
Using int( ) around the last column variable eliminates this
problem.  Therefore, I propose the attached patch.
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