setting WIN32_LEAN_AND_MEAN as a compiler define for windows builds.

network/main/makefile.win

@@ -31,7 +31,7 @@ include <$(DEPTH)\config\config.mak>
 # Make sure we have MOZILLA_CLIENT defined so we get the
 #   proper JS includes
 #
-LCFLAGS		= $(LCFLAGS)  -DMOZILLA_CLIENT
+LCFLAGS		= $(LCFLAGS) -DWIN32_LEAN_AND_MEAN -DMOZILLA_CLIENT
 
 !ifdef BUILD_DEBUG_GC
 LCFLAGS		= $(LCFLAGS) -DDEBUG_GC

network/module/makefile.win

@@ -91,7 +91,7 @@ DLL=.\$(OBJDIR)\$(DLLNAME)
 #//     (ie. LCFLAGS, LLFLAGS, LLIBS, LINCS)
 #//
 #//------------------------------------------------------------------------
-LCFLAGS=-DNETSCAPE -D_IMPL_NS_NET 
+LCFLAGS=-DNETSCAPE -D_IMPL_NS_NET -DWIN32_LEAN_AND_MEAN
 
 NETLIBS=\
 		$(DIST)\lib\abouturl.lib    \