test_driver: Add --debug option to avoid deleting the build directory
test_driver: Add --debug option to avoid deleting the build directory

This is particularly useful when debugging Toolchain

thewtex/cross-compilers,dockcross/dockcross,dockcross/dockcross,thewtex/cross-compilers,thewtex/cross-compilers,dockcross/dockcross,dockcross/dockcross,thewtex/cross-compilers