Bazel: code reorganization

defs.bzl

@@ -3,17 +3,3 @@ codeql_platform = select({
     "@platforms//os:macos": "osx64",
     "@platforms//os:windows": "win64",
 })
-
-_paths_bzl = """
-def source_dir():
-    return '%s/' + native.package_name()
-"""
-
-def _ql_utils_impl(repository_ctx):
-    root = repository_ctx.path(Label("@ql//:WORKSPACE.bazel")).realpath.dirname
-    repository_ctx.file("BUILD.bazel")
-    repository_ctx.file("paths.bzl", content = _paths_bzl % root)
-
-ql_utils = repository_rule(
-    implementation = _ql_utils_impl,
-)