(PUP-2881) Remove win32-taskscheduler gem

 - win32-taskscheduler code has been partially vendored in Puppet core
   and rewritten to be FFI / x64 compatible.  This was done since the
   win32-taskscheduler 0.3.0 gem does not support Windows 2003, and
   Puppet needs to maintain backwards compatibility.
Merge pull request #48 from Iristyle/ticket/1.9.3-x86/PUP-2881-remove-win32-taskscheduler-gem-ruby-193

(PUP-2881) Remove win32-taskscheduler gem