Add rstrip encoder for use in %rename.

This is like the strip encoder but strips the symbol's suffix instead
of the prefix.

Examples/test-suite/common.mk

@@ -344,6 +344,7 @@ CPP_TEST_CASES += \
 	rename2 \
 	rename3 \
 	rename4 \
+	rename_rstrip_encoder \
 	rename_scope \
 	rename_simple \
 	rename_strip_encoder \

Examples/test-suite/python/rename_rstrip_encoder_runme.py

@@ -0,0 +1,5 @@
+from rename_rstrip_encoder import *
+
+s = SomeThing()
+a = AnotherThing()
+a.DoClsX()

Examples/test-suite/rename_rstrip_encoder.i

@@ -0,0 +1,15 @@
+%module rename_rstrip_encoder
+
+// strip the Cls suffix from all identifiers
+%rename("%(rstrip:[Cls])s") ""; 
+
+%inline %{
+
+class SomeThingCls {
+};
+
+struct AnotherThingCls {
+    void DoClsXCls() {}
+};
+
+%}