as the flags should be a string, not a list
tested using
cmake -DCMAKE_LINKER=gold -DWITH_ASAN=ON -DWITH_ASAN_LEAK=ON \
-DCMAKE_BUILD_TYPE=Debug
on ubuntu xenial
without this change, cmake will fail with following warning:
CMake Error at src/CMakeLists.txt:112 (message):
The compiler /usr/bin/c++ has no C++17 support.
-- Configuring incomplete, errors occurred!
Signed-off-by: Kefu Chai <kchai@redhat.com>