nsis: request admin execution level
The current state of our NSIS installer doesn't support per-user installation and needs a major rework to do so, therefore the user is required to have admin privileges to install VLC. Still, RequestExecutionLevel was set to 'user' to be able to drop privileges when launching vlc.exe at the end of the installation but this was improved since (90496f23) and confirmed by the accesschk tool. However requesting user execution level makes the unpacking occurs twice: once with the user level and once after elevation. Requesting admin permissions fixes the unpacking issue while still being safe when launching VLC after the installation on XP and above.
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