Ignore non-matching regex renames when searching renames list.

Skip over %renames with non-matching %(regex)s expansion when looking for the
one to apply to the given name. This allows to have multiple anonymous renames
using regex as now the first _matching_ one will be used instead of always
using the first one and ignoring all the rest of them.

Extend unit tests to verify that applying two anonymous %renames does work as
expected.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@12293 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/csharp/rename_pcre_encoder_runme.cs

@@ -0,0 +1,12 @@
+using System;
+using rename_pcre_encoderNamespace;
+
+public class runme {
+  static void Main() {
+    SomeWidget w = new SomeWidget();
+    w.putBorderWidth(17);
+    if ( w.getBorderWidth() != 17 )
+      throw new Exception(String.Format("Border with should be 17, not {0}",
+                                        w.getBorderWidth()));
+  }
+}