Bug 1099430, part 1: Proxy the config/* makefiles to mozilla-central, r=glandium. To avoid screwing up the WIN_TOP_SRC changes (see part 二), we need to drop this text from comm-central. We cannot eliminate these files altogether, since the initial import needs to include $(topsrcdir) instead of $(MOZILLA_DIR) to grab the MOZILLA_DIR declaration in baseconfig.mk.

#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

# Just use mozilla-central's copy of config.mk now.
include $(MOZILLA_DIR)/config/config.mk