redo-always/redo-ifcreate/redo-stamp: work inside chdir().

If someone cd's to another directory and then runs redo-always, we weren't
adding to the right target.

redo-ifcreate.py

@@ -5,12 +5,14 @@ from log import err
 
 
 try:
-    me = state.File(name=vars.TARGET)
+    me = os.path.join(vars.STARTDIR, 
+                      os.path.join(vars.PWD, vars.TARGET))
+    f = state.File(name=me)
     for t in sys.argv[1:]:
         if os.path.exists(t):
             err('redo-ifcreate: error: %r already exists\n' % t)
             sys.exit(1)
         else:
-            me.add_dep('c', t)
+            f.add_dep('c', t)
 except KeyboardInterrupt:
     sys.exit(200)