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/python/rename_pcre_encoder_runme.py

@@ -2,6 +2,9 @@ from rename_pcre_encoder import *
 
 s = SomeWidget()
 s.putBorderWidth(3)
+if s.getBorderWidth() != 3:
+    raise RuntimeError("Border should be 3, not %d" % (s.getBorderWidth(),))
+
 s.putSize(4, 5)
 a = AnotherWidget()
 a.DoSomething()