Fixup for windows builds after bug 644608. rs=Ms2ger

layout/media/Makefile.in

@@ -106,10 +106,6 @@ else
 EXTRA_DSO_LDOPTS += $(MOZ_ZLIB_LIBS)
 endif
 
-ifdef MOZ_CUBEB
-EXTRA_DSO_LDOPTS += $(call EXPAND_LIBNAME, winmm)
-endif
-
 DEFFILE = symbols.def
 endif
 
@@ -118,4 +114,9 @@ include $(topsrcdir)/config/rules.mk
 ifeq (WINNT,$(OS_TARGET))
 symbols.def: symbols.def.in
 	$(PYTHON) $(topsrcdir)/config/Preprocessor.py $(ACDEFINES) $< > $@
+
+ifdef MOZ_CUBEB
+OS_LIBS += $(call EXPAND_LIBNAME, winmm)
+endif
+
 endif