perl-5.17.11 fails to build with x64 mingw64 (gcc-4.7.0)

# New Ticket Created by  "Sisyphus"
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# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=117687 >

This is a bug report for perl from sisyphus@OWNER-PC311012,
generated with the help of perlbug 1.39 running under perl 5.17.11.

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[Please describe your issue here]

This is essentially a repeat of a post sent to p5p on March 24 2013
titled "[Win32] perl-5.17.10 fails to build with x64 mingw64 (gcc-4.7.0)"

The issue still exists for 5.17.11 (for me).

The error I get is:

In file included from ../hv.h:570:0,
                 from ../perl.h:3480,
                 from perllib.c:10:
../hv_func.h: In function 'U32 S_perl_hash_murmur3(const unsigned char*,
const u
nsigned char*, STRLEN)':
../hv_func.h:395:20: error: cast from 'const unsigned char*' to 'long int'
loses
precision [-fpermissive]

Signed-off-by: Chris 'BinGOs' Williams <chris@bingosnet.co.uk>