provide cgo.opt and vank_go.h as data files during install

swig/src/Makefile

@@ -64,6 +64,8 @@ GOINTERFACES = $(GOSRC) interface/vanktypemaps.i
 OUTDIRGO=$(OBJ)/go
 GOLIB=$(OUTDIRGO)/libvank_go$(GO_SO)
 GOLIBGO=go/vank_go.go
+GOLIBGOHDR=go/vank_go.h
+GOLIBGOOPT=go/cgo.opt
 
 PHPSRC=interface/vank.i
 PHPINTERFACES = $(PHPSRC) interface/vanktypemaps.i
@@ -252,6 +254,8 @@ ifeq ($(WITH_SWIG), 1)
   ifeq ($(WITH_GO), 1)
 	$(INSTALL_PROGRAM) $(GOLIB) $(libdir)
 	$(INSTALL_DATA) $(GOLIBGO) $(pkgdatadir)
+	$(INSTALL_DATA) $(GOLIBGOHDR) $(pkgdatadir)
+	$(INSTALL_DATA) $(GOLIBGOOPT) $(pkgdatadir)
   endif
   ifeq ($(WITH_PHP), 1)
 	$(INSTALL_PROGRAM) $(PHPLIB) $(libdir)