Revert "add coverage flags for old gcc version"
Revert "add coverage flags for old gcc version"

This reverts commit a1f8fb42f000a9297cbebeb7d4728ff6159b057a.

tboox/xmake,waruqi/xmake,tboox/xmake,tboox/xmake,tboox/xmake,tboox/xmake,waruqi/xmake,waruqi/xmake,waruqi/xmake,waruqi/xmake,waruqi/xmake,tboox/xmake,waruqi/xmake,tboox/xmake