Add catches_strings test to test throws char * typemap

Examples/test-suite/go/catches_strings_runme.go

@@ -0,0 +1,17 @@
+package main
+
+import "strings"
+import . "swigtests/catches_strings"
+
+func main() {
+  exception_thrown := false
+  func() {
+    defer func() {
+      exception_thrown = strings.Index(recover().(string), "charstring message") == 0
+    }()
+    StringsThrowerCharstring()
+  }()
+  if !exception_thrown {
+    panic(0)
+  }
+}