Fix #includes to work with Visual Studio 2013

Cherry-pick of trunk r3076.

git-svn-id: https://cantera.googlecode.com/svn/cantera/branches/2.1@3157 02a645c2-efd0-11dd-984d-ab748d24aa7e
[SCons] Fix build errors when path to Python contains spaces

Adaptation of trunk r3075.

git-svn-id: https://cantera.googlecode.com/svn/cantera/branches/2.1@3158 02a645c2-efd0-11dd-984d-ab748d24aa7e