Fix include paths for Windows builds

Author: theotherjimmy

tools/toolchains/__init__.py

@@ -612,6 +612,7 @@ def _add_dir(self, path, resources, base_path, exclude_paths=None):
                             break
 
             # Add root to include paths
+            root = root.rstrip("/")
             resources.inc_dirs.append(root)
             resources.file_basepath[root] = base_path