Patch #734231: Update RiscOS support. In particular, correct
riscospath.extsep, and use os.extsep throughout.
diff --git a/Lib/site.py b/Lib/site.py
index e862fc2..13522b1 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -162,7 +162,7 @@
     prefixes.append(sys.exec_prefix)
 for prefix in prefixes:
     if prefix:
-        if sys.platform == 'os2emx':
+        if sys.platform in ('os2emx', 'riscos'):
             sitedirs = [os.path.join(prefix, "Lib", "site-packages")]
         elif os.sep == '/':
             sitedirs = [os.path.join(prefix,