Fix srcdir <> objdir builds with ocaml 2.10. Downrev versions don't care whether
'dir' exists in 'ocamldep -I dir ...', but recent ones demand that it actually
exists.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42245 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/bindings/ocaml/Makefile.ocaml b/bindings/ocaml/Makefile.ocaml
index 1f772a4..4c65ca8 100644
--- a/bindings/ocaml/Makefile.ocaml
+++ b/bindings/ocaml/Makefile.ocaml
@@ -88,7 +88,8 @@
 $(ObjDir)/%.ml: $(PROJ_SRC_DIR)/%.ml $(ObjDir)/.dir
 	$(Verb) $(CP) -f $< $@
 
-$(ObjDir)/$(LIBRARYNAME).ocamldep: $(OcamlSources) $(OcamlHeaders)
+$(ObjDir)/$(LIBRARYNAME).ocamldep: $(OcamlSources) $(OcamlHeaders) \
+                                   $(OcamlDir)/.dir $(ObjDir)/.dir
 	$(Verb) $(OCAMLDEP) $(OCAMLCFLAGS) $(OcamlSources) $(OcamlHeader) > $@
 
 -include $(ObjDir)/$(LIBRARYNAME).ocamldep