(PUP-392) update win32-eventlog

This brings eventlog up to the latest gem and fixes the constants it uses.
(PUP-392) Upgrade win32-process

 - This upgrades the win32-process gem from 0.6.5 to 0.7.4.
 - Win32::Process wil not return a custom error anymore, just SystemCallError.
  Since this can be used for amny things, limit down SystemCallError to be
   rescued only if we are on Windows.
(PUP-392) Upgrade win32-dir to 0.4.9

This upgrades win32-dir from 0.4.3 to 0.4.9 (for both platforms).
Merge branch 'pr/2830'

* pr/2830:
  (PUP-392) Upgrade win32-dir to 0.4.9
  (PUP-392) Upgrade win32-process
  (PUP-392) update win32-eventlog