fix(py-flit-core): add build-tool tag

packages/py-flit-core/package.py

@@ -11,6 +11,9 @@ class PyFlitCore(PythonPackage):
 
     homepage = "https://github.com/pypa/flit"
     pypi = "flit-core/flit_core-3.9.0.tar.gz"
+    # begin EBRAINS (added): tag as build-tool
+    tags = ["build-tools"]
+    # end EBRAINS
     maintainers("takluyver")
 
     version("3.9.0", sha256="72ad266176c4a3fcfab5f2930d76896059851240570ce9a98733b658cb786eba")