Remove sys.platform == 'riscos' checks from some Python and test files. #16501
diff --git a/Lib/site.py b/Lib/site.py
index 468d83e..41bea42 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -300,9 +300,7 @@
             continue
         seen.add(prefix)
 
-        if sys.platform == 'riscos':
-            sitepackages.append(os.path.join(prefix, "Lib", "site-packages"))
-        elif os.sep == '/':
+        if os.sep == '/':
             sitepackages.append(os.path.join(prefix, "lib",
                                         "python" + sys.version[:3],
                                         "site-packages"))