Build

gnome-desktop-thumbnail.c: Initialize empty pixbuf. #103

Job	Run time
build / build (mint22, linuxmintd/mint22-amd64, Mint 22, true) / Mint 22	2m 2s
build / build (lmde7, linuxmintd/lmde7-amd64, LMDE 7, false) / LMDE 7	2m 30s
	4m 32s

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