Add featuring masks/enable #323

Job	Run time
7.0/ubuntu-20.04/gcc/default/	1m 13s
7.0/ubuntu-20.04/gcc/static/	1m 26s
3.15/ubuntu-20.04/gcc/default/	1m 3s
3.14/ubuntu-20.04/gcc/default/	1m 57s
7.0/ubuntu-20.04/gcc/static/CMD_CXXFLAGS=-std=c++11	1m 16s
7.0/ubuntu-20.04/clang/default/CMD_CXXFLAGS=-std=c++11	1m 31s
7.0/ubuntu-20.04/gcc/default4.10/	1m 50s
7.0/ubuntu-20.04/gcc/default4.9/	1m 38s
7.0/ubuntu-20.04/gcc-8/default/	1m 42s
7.0/ubuntu-20.04/clang/default/	1m 26s
7.0/ubuntu-latest/gcc/default/	1m 29s
	16m 31s

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