perl checking

These two small patches allow us to run "perl -cw" cleanly on all our
perl code.

One patch silences a warning from convutils.pl about the unportability
of the literal 0x100000000. We've run for many years without this giving
us a problem, so I think we can turn the warning off pretty safely.

The other patch provides a dummy library that emulates just enough of
the Win32 perl infrastructure to allow us to run these checks. That
means that Unix-based developers who might want to make changes in the
msvc code can actually run a check against their code without having to
put it on a Windows machine. The invocation goes like this (to check
Mkvcbuild.pl for example):

PERL5LIB=src/tools/msvc/dummylib perl -cw src/tools/Mkvcbuild.pm

This also allows us to check src/tools/win32tzlist.pl.

In due course I'll submit a script to automate this syntax checking.

cheers

andrew

--
Andrew Dunstan https://www.2ndQuadrant.com
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