add some quotes for good measure

Makefile

@@ -47,12 +47,12 @@ haxe: $(MODULES:=.cmx)
 	$(OCAMLOPT) -o $(OUTPUT) $(NATIVE_LIBS) $(LIBS) $(MODULES:=.cmx)
 
 haxelib:
-	$(OUTPUT) --cwd $(CURDIR)/std/tools/haxelib haxelib.hxml
-	cp $(CURDIR)/std/tools/haxelib/haxelib$(EXTENSION) haxelib$(EXTENSION)
+	$(OUTPUT) --cwd "$(CURDIR)/std/tools/haxelib" haxelib.hxml
+	cp std/tools/haxelib/haxelib$(EXTENSION) haxelib$(EXTENSION)
 
 haxedoc:
-	$(OUTPUT) --cwd $(CURDIR)/std/tools/haxedoc haxedoc.hxml
-	cp $(CURDIR)/std/tools/haxedoc/haxedoc$(EXTENSION) haxedoc$(EXTENSION)
+	$(OUTPUT) --cwd "$(CURDIR)/std/tools/haxedoc" haxedoc.hxml
+	cp std/tools/haxedoc/haxedoc$(EXTENSION) haxedoc$(EXTENSION)
 
 tools: haxelib haxedoc