Add a "diamond" pattern to multi-impmort test

This tests whether multiple modules can correctly import
the same common module.

```
a -> d
  -> b -> c -> d*
```

Examples/test-suite/go/Makefile.in

@@ -67,7 +67,7 @@ multi_import.multicpptest:
 	if ! test -d gopath/multi_import/src/swigtests; then \
 	  (cd gopath/multi_import/src && ln -s . swigtests); \
 	fi
-	for f in multi_import_b multi_import_a; do \
+	for f in multi_import_d multi_import_b multi_import_a; do \
 	  $(MAKE) -f $(top_builddir)/$(EXAMPLES)/Makefile SRCDIR='$(SRCDIR)' CXXSRCS='$(CXXSRCS)' \
 	  SWIG_LIB_DIR='$(SWIG_LIB_DIR)' SWIGEXE='$(SWIGEXE)' \
 	  LIBS='$(LIBS)' INCLUDES='$(INCLUDES)' SWIGOPT='$(SWIGOPT)' NOLINK=true \
@@ -181,6 +181,7 @@ clean:
 	rm -f mod_a.go mod_a.gox mod_b.go mod_b.gox
 	rm -f multi_import_a.go multi_import_a.gox
 	rm -f multi_import_b.go multi_import_b.gox
+	rm -f multi_import_d.go multi_import_d.gox
 	rm -f packageoption_a.go packageoption_a.gox
 	rm -f packageoption_b.go packageoption_b.gox
 	rm -f packageoption_c.go packageoption_c.gox

Examples/test-suite/javascript/Makefile.in

@@ -134,7 +134,7 @@ clean:
 		rm -f imports_a$${ext} imports_b$${ext}; \
 		rm -f import_stl_a$${ext} import_stl_b$${ext}; \
 		rm -f mod_a$${ext} mod_b$${ext}; \
-		rm -f multi_import_a$${ext} multi_import_b$${ext}; \
+		rm -f multi_import_a$${ext} multi_import_b$${ext} multi_import_d$${ext}; \
 		rm -f packageoption_a$${ext} packageoption_b$${ext} packageoption_c$${ext}; \
 		rm -f template_typedef_cplx2$${ext}; \
 	done

Examples/test-suite/multi_import.list

@@ -1,2 +1,3 @@
-multi_import_a
+multi_import_d
 multi_import_b
+multi_import_a

Examples/test-suite/multi_import_a.i

@@ -2,7 +2,8 @@
 
 %module multi_import_a
 
-%import multi_import_b.i
+%import multi_import_d.i
+%import "multi_import_b.i"
 
 %{
 #include "multi_import.h"

Examples/test-suite/multi_import_c.i

@@ -1,3 +1,5 @@
+%import "multi_import_d.i"
+
 class XXX
 {
 public:

Examples/test-suite/multi_import_d.i

@@ -0,0 +1,3 @@
+%module multi_import_d
+
+%constant int myval = 1234;

Examples/test-suite/ocaml/Makefile.in

@@ -106,6 +106,6 @@ clean:
 	rm -f import_stl_a.ml import_stl_b.ml
 	rm -f imports_a.ml imports_b.ml
 	rm -f mod_a.ml mod_b.ml
-	rm -f multi_import_a.ml multi_import_b.ml
+	rm -f multi_import_a.ml multi_import_b.ml multi_import_d.ml
 	rm -f packageoption_a.ml packageoption_b.ml packageoption_c.ml
 	rm -f template_typedef_cplx2.ml

Examples/test-suite/php/Makefile.in

@@ -86,6 +86,6 @@ clean:
 	rm -f import_stl_a.php import_stl_b.php php_import_stl_a.h php_import_stl_b.h
 	rm -f imports_a.php imports_b.php php_imports_a.h php_imports_b.h
 	rm -f mod_a.php mod_b.php php_mod_a.h php_mod_b.h
-	rm -f multi_import_a.php multi_import_b.php php_multi_import_a.h php_multi_import_b.h
+	rm -f multi_import_a.php multi_import_b.php multi_import_d.php php_multi_import_a.h php_multi_import_b.h php_multi_import_d.h
 	rm -f packageoption_a.php packageoption_b.php packageoption_c.php php_packageoption_a.h php_packageoption_b.h php_packageoption_c.h
 	rm -f template_typedef_cplx2.php php_template_typedef_cplx2.h

Examples/test-suite/python/Makefile.in

@@ -146,7 +146,7 @@ clean:
 	rm -f clientdata_prop_a.py clientdata_prop_b.py import_stl_a.py import_stl_b.py
 	rm -f hugemod.h hugemod_a.i hugemod_b.i hugemod_a.py hugemod_b.py hugemod_runme.py
 	rm -f imports_a.py imports_b.py mod_a.py mod_b.py multi_import_a.py
-	rm -f multi_import_b.py packageoption_a.py packageoption_b.py packageoption_c.py
+	rm -f multi_import_b.py multi_import_d.py packageoption_a.py packageoption_b.py packageoption_c.py
 	rm -f template_typedef_cplx2.py
 
 hugemod_runme = hugemod$(SCRIPTPREFIX)

Examples/test-suite/template_typedef_cplx2.h

@@ -113,6 +113,8 @@ namespace vfncs {
 #ifndef SWIG
 
 // Initialize these static class members
+// XXX Since this is a header file, the following creates the symbols in *each* SWIG _wrap.cxx file. Linking the resulting SWIG modules together may result in
+// duplicate symbol link errors.
 
 const char* const arith_traits< double, double >::arg_type = "double";
 const char* const arith_traits< double, double >::res_type = "double";