Make one more thing in Python compile for macOS on arm64

Change-Id: I6716048f0b58eb502b9d1ade8a13b8e33e4aaf2b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/105905
Tested-by: Jenkins
Reviewed-by: Tor Lillqvist <tml@collabora.com>
diff --git a/external/python3/macos-11.patch.0 b/external/python3/macos-11.patch.0
index d6bc4e5..23fc5f97 100644
--- a/external/python3/macos-11.patch.0
+++ b/external/python3/macos-11.patch.0
@@ -36,3 +36,15 @@
         system_include_dirs = ['/usr/include']
         # lib_dirs and inc_dirs are used to search for files;
         # if a file is found in one of those directories, it can
--- Modules/_decimal/libmpdec/mpdecimal.h
+++ Modules/_decimal/libmpdec/mpdecimal.h
@@ -135,6 +135,9 @@
   #elif defined(__x86_64__)
     #define CONFIG_64
     #define ASM
+  #elif defined(__arm64__)
+    #define CONFIG_64
+    #define ANSI
   #else
     #error "unknown architecture for universal build."
   #endif