3605.	[port]		win32: Addressed several compatibility issues
			with newer versions of Visual Studio. [RT #33916]

Squashed commit of the following:

commit 4127af15f85da90cf2bd3a0c5a558daae89e833a
Author: Francis Dupont <fdupont@isc.org>
Date:   Tue Jun 25 22:41:53 2013 +0200

    make the last change to be text

commit 21ef4891b9ee3e3aefb45d4c80d5cb7ec78f264f
Author: Curtis Blackburn <ckb@isc.org>
Date:   Tue Jun 25 12:35:08 2013 -0500

    [rt33916] re-worded for easier reading

commit 83828e47e62fea4070441e645ba8fed338255ceb
Author: Francis Dupont <fdupont@isc.org>
Date:   Mon Jun 24 16:08:11 2013 +0200

    introduce a VCRedistPath env var

commit 0337f2554f168993a65945e78c2879e9bfca5293
Author: Francis Dupont <fdupont@isc.org>
Date:   Sun Jun 23 01:23:26 2013 +0200

    _adjust_fdiv for VS < 2010

commit 375fdd5c06be276b0ff0ad589c0e22b809339fe9
Author: Francis Dupont <fdupont@isc.org>
Date:   Thu Jun 20 16:27:04 2013 +0200

    move to MSVC v1600 as it still breaks on VS 2010

commit bfcaf72071e9d8df1d0ce0c5f05b69acd51bf698
Author: Francis Dupont <fdupont@isc.org>
Date:   Thu Jun 20 15:57:35 2013 +0200

    WIN32: avoid addrinfo redef

commit 18504c3e50b11e66a0b573c7cb3d61094bfa5b52
Author: Francis Dupont <fdupont@isc.org>
Date:   Thu Jun 20 15:54:38 2013 +0200

    WIN32: fseek/ftell

commit f9a4fdccc5ab1c74c64412fb76da7dfd161787b2
Author: Francis Dupont <fdupont@isc.org>
Date:   Thu Jun 20 15:13:01 2013 +0200

    fix WIN32 error redefs in net.h (isc ad lwres libs)