[PATCH] for GUB - NSIS: Speed up uninstallers.

[Patrick McCarty]

Hello,

The changes found in this patch make the GUB Windows uninstallers
*much* faster.  Before, uninstalling LilyPond on Windows could take up
to 10 minutes, and these changes appear to have cut that time down to
about 20 seconds.

As the commit description notes, I incorporated the recent script
improvements from this wiki page:
http://nsis.sourceforge.net/Uninstall_only_installed_files

Let me know if there are any problems.

Thanks,
Patrick

0001-NSIS-Speed-up-uninstallers.patch
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