gyp: fix utf8 encoding

Author: owl-from-hogvarts

gyp/pylib/gyp/input.py

@@ -225,7 +225,7 @@ def LoadOneBuildFile(build_file_path, data, aux_data, includes, is_target, check
         return data[build_file_path]
 
     if os.path.exists(build_file_path):
-        build_file_contents = open(build_file_path).read()
+        build_file_contents = open(build_file_path, encoding='utf-8').read()
     else:
         raise GypError(f"{build_file_path} not found (cwd: {os.getcwd()})")