Add import for tools in conanfile.py

Author: ThomasKroes

conanfile.py

@@ -1,6 +1,7 @@
 from conans import ConanFile
 from conan.tools.cmake import CMakeDeps, CMake, CMakeToolchain
 from conans.tools import save, load
+from conans import tools
 import os
 import pathlib
 import subprocess