Add featuring masks/enable #335

Job	Run time
7.0/ubuntu-20.04/gcc/default/	1m 23s
7.0/ubuntu-20.04/gcc/static/	1m 13s
3.15/ubuntu-20.04/gcc/default/	1m 17s
3.14/ubuntu-20.04/gcc/default/	1m 50s
7.0/ubuntu-20.04/gcc/static/CMD_CXXFLAGS=-std=c++11	1m 22s
7.0/ubuntu-20.04/clang/default/CMD_CXXFLAGS=-std=c++11	1m 22s
7.0/ubuntu-20.04/gcc/default4.10/	1m 41s
7.0/ubuntu-20.04/gcc/default4.9/	1m 55s
7.0/ubuntu-20.04/gcc-8/default/	1m 34s
7.0/ubuntu-20.04/clang/default/	1m 8s
7.0/ubuntu-latest/gcc/default/	1m 20s
	16m 5s

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