Issue #9561: distutils now reads and writes egg-info files using UTF-8

instead of the locale encoding.

command/install_egg_info.py

@@ -40,9 +40,8 @@ class install_egg_info(Command):
                          "Creating "+self.install_dir)
         log.info("Writing %s", target)
         if not self.dry_run:
-            f = open(target, 'w')
+            with open(target, 'w', encoding='UTF-8') as f:
                 self.distribution.metadata.write_pkg_file(f)
-            f.close()
 
     def get_outputs(self):
         return self.outputs

dist.py

@@ -1010,11 +1010,9 @@ class DistributionMetadata:
     def write_pkg_info(self, base_dir):
         """Write the PKG-INFO file into the release tree.
         """
-        pkg_info = open(os.path.join(base_dir, 'PKG-INFO'), 'w')
-        try:
+        with open(os.path.join(base_dir, 'PKG-INFO'), 'w',
+                  encoding='UTF-8') as pkg_info:
             self.write_pkg_file(pkg_info)
-        finally:
-            pkg_info.close()
 
     def write_pkg_file(self, file):
         """Write the PKG-INFO format data to a file object.