Master fixes for msvc10

Some fixes to build CTL libs (IlmCtl, IlmCtlMath, IlmCtlSimd, IlmImfCtl) on Windows 7 64 bits with msvc 10.
These commits are intended to be merged in master branch.

I also made 2 modifications that I didn't include in this pull request because they concern nukeNode branch: 
- [an msvc fix](https://github.com/mfe/CTL/commit/804ea0b505a6213ceaa7ae34b0961e2f072346a9)
- [a patch](https://github.com/mfe/CTL/commit/9165d891bc6ceb7240dd1856e9fb54ce66a6f344) which is a temporary workaround so that the node can be used on Windows. It'll need a proper correction.

Please note that the modifications I made in master also need to be merged in nukeNode branch so that the plugin could be built.