Continuing to work on changes to JNI build scripts to support true...

Continuing to work on changes to JNI build scripts to support true 32-bit/64-bit cross-compilation from 64-bit OS's. This will cut-down on the need for Jenkins to spin-up 32-bit OS's and 64-bit OS's just to support 32-bit users. Also, MinGW support has been removed. If this is still needed in the future, it should be straightforward to review the commit history and add it back.