reenable objdir. see if it busts talkback

tools/tinderbox-configs/sunbird/win32/tinder-config.pl

@@ -156,7 +156,7 @@ $moz_cvsroot   = ":ext:cltbld\@cvs.mozilla.org:/cvsroot";
 #$moz_client_mk = 'client.mk';
 
 #- Set if you want to build in a separate object tree
-#$ObjDir = 'sunbird-obj';
+$ObjDir = 'sunbird-obj';
 
 # Extra build name, if needed.
 $BuildNameExtra = 'Sb-Nightly';