matplotlib patch for using Songti SC (from Songti.ttc) on macOS

matplotlib-SongtiSC.patch

diff --git a/lib/matplotlib/font_manager.py b/lib/matplotlib/font_manager.py
index 9602db7..1ddec34 100644
--- a/lib/matplotlib/font_manager.py
+++ b/lib/matplotlib/font_manager.py
@@ -66,7 +66,7 @@ except ImportError:
     from backports.functools_lru_cache import lru_cache
 
 
-USE_FONTCONFIG = False
+USE_FONTCONFIG = True
 verbose = matplotlib.verbose
 
 font_scalings = {
@@ -163,7 +163,7 @@ def get_fontext_synonyms(fontext):
     Return a list of file extensions extensions that are synonyms for
     the given file extension *fileext*.
     """
-    return {'ttf': ('ttf', 'otf'),
+    return {'ttf': ('ttf', 'ttc', 'otf'),
             'otf': ('ttf', 'otf'),
             'afm': ('afm',)}[fontext]