[7u] RFR: 8254982: (tz) Upgrade time-zone data to tzdata2020c

[Dmitry Cherepanov]

Bug: https://bugs.openjdk.java.net/browse/JDK-8254982
8u commit: https://hg.openjdk.java.net/jdk8u/jdk8u/jdk/rev/25cd39ef5b98
Webrev: http://cr.openjdk.java.net/~dcherepanov/openjdk7u/8254982/webrev.v1/

The patch for 8u doesn't apply cleanly to 7u. The following modifications were done:

1) adjusted paths for tzdata files (make/data/tzdata -> make/sun/javazic/tzdata)

2) test/sun/util/calendar/*
         Not applicable to 7u

Ran relevant regression tests (including BasicDateTime), not issues found.

Thanks,

Dmitry