enable ASLR and NX on windows builds (affects 2.x only)

[reaperhulk]

An experiment to fix #2021. Not sure if this is the right place to put the args yet.

[reaperhulk]

This is blocked while gathering more info from the reporter in #2021.

[alex]

retest this please

[reaperhulk]

I have updated this PR and confirmed that the expected dynamic base and NX compatible attributes are present on Windows now.

[alex]

git grep 'NXCOMPAT' and git grep 'DYNAMICBASE' don't have any results in a CPython checkout?

[alex]

Ok, that's because this info is in some XML. That said, https://msdn.microsoft.com/en-us/library/ms235442.aspx and https://msdn.microsoft.com/en-us/library/bb384887.aspx indicate these are on by default?

[reaperhulk]

@schlenk understands this far better than I do, but I believe these were not defaulted to on in 2008 (which is the compiler used for 2.6/2.7)

[schlenk]

Yes. The default is ON since Visual Studio 2010, OFF for Visual Studio 2008. So all the Python 2.7 modules don't have it, unless explicitly specified.