Add featuring masks/enable #321

Job	Run time
7.0/ubuntu-20.04/gcc/default/	1m 11s
7.0/ubuntu-20.04/gcc/static/	1m 35s
3.15/ubuntu-20.04/gcc/default/	1m 16s
3.14/ubuntu-20.04/gcc/default/	1m 39s
7.0/ubuntu-20.04/gcc/static/CMD_CXXFLAGS=-std=c++11	1m 12s
7.0/ubuntu-20.04/clang/default/CMD_CXXFLAGS=-std=c++11	1m 12s
7.0/ubuntu-20.04/gcc/default4.10/	1m 38s
7.0/ubuntu-20.04/gcc/default4.9/	1m 37s
7.0/ubuntu-20.04/gcc-8/default/	1m 19s
7.0/ubuntu-20.04/clang/default/	1m 5s
7.0/ubuntu-latest/gcc/default/	1m 22s
	15m 6s

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