Linux: --install-to-desktop: Support easy install of desktop icon for… #638

Job	Run time
build-linux (ubuntu-22.04, 3.8)	2m 20s
build-linux (ubuntu-22.04, 3.9)	2m 11s
build-macos (macos-latest, 3.8)	4m 35s
build-macos (macos-latest, 3.9)	4m 29s
build-windows (windows-2019, 3.8)	8m 42s
build-windows (windows-2019, 3.9)	8m 43s
build-windows (windows-latest, 3.8)	12m 24s
build-windows (windows-latest, 3.9)	15m 2s
	58m 26s

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