Bug 1046929. Remove ACDEFINES += -UWIN32_LEAN_AND_MEAN from gfx/thebes/Makefile.in

This is very old and doesn't seem to be needed anymore.

--HG--
extra : rebase_source : 557fe01c658f7644fe8ecd35e96a5e8e285be718

gfx/thebes/Makefile.in

@@ -2,10 +2,6 @@
 # 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/.
 
-ifeq ($(MOZ_WIDGET_TOOLKIT),windows)
-ACDEFINES +=	-UWIN32_LEAN_AND_MEAN
-endif
-
 include $(topsrcdir)/config/rules.mk
 
 DEFINES := $(filter-out -DUNICODE,$(DEFINES))