Added INCLUDE and LIB environment variables when invoking MSVC.
Added INCLUDE and LIB environment variables when invoking MSVC.

jonathanpeppers/Embeddinator-4000,tritao/MonoManagedToNative,mono/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,mono/Embeddinator-4000,mono/Embeddinator-4000,mono/Embeddinator-4000,tritao/MonoManagedToNative,mono/Embeddinator-4000,tritao/MonoManagedToNative,mono/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,mono/Embeddinator-4000,jonathanpeppers/Embeddinator-4000,jonathanpeppers/Embeddinator-4000