Issue #21623: open pyproject.props with an explicit encoding

PCbuild/build_ssl.py

@@ -66,7 +66,7 @@ def find_working_perl(perls):
 # Fetch SSL directory from VC properties
 def get_ssl_dir():
     propfile = (os.path.join(os.path.dirname(__file__), 'pyproject.props'))
-    with open(propfile) as f:
+    with open(propfile, encoding='utf-8-sig') as f:
         m = re.search('openssl-([^<]+)<', f.read())
         return "..\..\openssl-"+m.group(1)