Add cairo block to linux#2136

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ppff wants to merge 4 commits intocinder:masterfrom

ppff:linux/add-cairo

Commits on Feb 14, 2020

Added cairo block cmake config and updated xml
Pierre Schefler
committed
Improved cairo cmake config
Pierre Schefler
committed
Fixed cairo block compilation on linux
Pierre Schefler
committed
Fixed cmakelists of all _svg samples, now supported on linux
Pierre Schefler
committed