(PUP-392) update win32 gems 

This is to update some of the simpler gems not known to cause upgrade issues. Any that do have their own separate tickets.

* Upgrade win32-eventlog to 0.6.1
* Upgrade win32-process to 0.7.4
* @Iristyle - fix for INVALID_FILE_ATTRIBUTES on x64
* Upgrade win32-dir to 0.4.9