Fix InstallIcons and CreateDesktopEntry operations usage as root

The operations write the output files to a valid, writable directory
value of XDG_DATA_HOME variable if set, otherwise defaulting to
"$HOME/.local/share". This follows the XDG Base Directory Specification
but misses the use case of system-wide installation: the XDG_DATA_HOME
should only contain base directory relative to which user specific data
files should be stored.

Prefer a predefined value "/usr/local/share" when launced as root or
the internal elevated admin rights handling is active. This should be
a sane and well known value for applications installed system-wide, and
should not conflict with files extracted by distribution's package
management system.

Task-number: QTIFW-2093
Change-Id: I96fab3367122e7df783697e07baeb71dfd9b3f0e
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Katja Marttila <katja.marttila@qt.io>

0 files changed, 0 insertions, 0 deletions