Fixes for windows build process

[Andrew Thompson]

In trying to test my ODBC patch on windows I encountered some build
issues (mainly related to using Visual Studio 2008). I've put a couple
script tweaks and some documentation fixes in a branch:

git fetch git://github.com/Vagabond/otp.git windows_build_fixes

I've been able to do a clean build/install from scratch using this
process (so long as I touch libs/gs/SKIP). Notes the changes are in the
commit messages.

Andrew