create mode 100644 test/standalone/libcxx/build.zig
 create mode 100644 test/standalone/libcxx/mt.zig
 create mode 100644 test/standalone/libcxx/mt_doit.cpp
 create mode 100644 test/standalone/libcxx/st.zig
 create mode 100644 test/standalone/libcxx/st_doit.cpp