Allow to build outside the source directory
Allow to build outside the source directory

Reviewed-by: James Cameron <979be511e3d216882811a349af33a6d24f3f5f99@laptop.org>
Acked-by: Simon Schampijer <simon@schampijer.de

gusDuarte/sugar-artwork,i5o/sugar-artwork,godiard/sugar-artwork,samdroid-apps/sugar-artwork,tchx84/debian-pkg-sugar-artwork,i5o/sugar-artwork,godiard/sugar-artwork,gusDuarte/sugar-artwork,gusDuarte/sugar-artwork,gusDuarte/sugar-artwork,tchx84/debian-pkg-sugar-artwork,samdroid-apps/sugar-artwork,sugarlabs/sugar-artwork,samdroid-apps/sugar-artwork,i5o/sugar-artwork,ceibal-tatu/sugar-artwork,sugarlabs/sugar-artwork,tchx84/debian-pkg-sugar-artwork,godiard/sugar-artwork,ceibal-tatu/sugar-artwork,ceibal-tatu/sugar-artwork,sugarlabs/sugar-artwork