Log Message:
Update archivers/gsharutils to 4.15.

This update is provided from kj Woolley in PR 49770,
with a patch by me for NetBSD 6.

Changes from previous:

Version 4.15 - February 2015, by Bruce Korb

* shar will no longer choke on 64 bit windows
* unshar has a compiler warning fix
* Happy 2015 copyright
* PO file updates

Version 4.14.2 - December 2014, by Bruce Korb

* translation updates
* use ftello, fseeko and fflush
* augment copyright marks in shar.c and shar-std.def
* Happy 2014 copyright dates
* fix up man pages (use newer doc generation code)

Version 4.14 - October 2013, by Bruce Korb

* documentation, obscure usage, FSF address