add multiple_inheritance example from Salvaire. It's working

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@6577 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/perl5/multiple_inheritance/runme.pl

@@ -0,0 +1,16 @@
+# file: runme.pl
+
+# This file test multiple inheritance
+
+use example;
+
+$foo_Bar = new example::Foo_Bar();
+
+print "must be foo: ";
+$foo_Bar->foo();
+
+print "must be bar: ";
+$foo_Bar->bar();
+
+print "must be foobar: ";
+$foo_Bar->fooBar();