currently this will add the -fstack-reuse=none flag to all builds with
all compilers except those who set ENABLE_CLANG_TIDY=ON even though only
gcc knows about it

this only adds -fstack-reuse=none to gcc builds

cmake -GNinja  
ninja -vn | grep fstack-reuse

see correct ninja dry-run with option set for gcc (it is the default compiler on my box)

cmake -GNinja -DCMAKE_CXX_COMPILER=clang++
ninja -vn | grep fstack-reuse

see no lines