NSIS 2.23

Minor Changes
- Fixed compiler crash on Mac OS X (patch #1611866)
- Fixed deletion of start menu icons in NSIS installer on Vista (bug #1611251)

Utilities and Plug-ins
- Fixed incorrect nsExec message handling in silent mode (bug #1605581)
- Fixed System crash when System::Store is called on an empty private stack (bug #1620178)
- Fixed System crash with parenthesis in filename (bug #1616267)
- Minor VPatch documentation enhancements (patch #1624292)

Build System
- Fixed build failures on mingw32 (bug #1610773)
- Fixed build problems with MSVCTOOLKIT=yes