temporarily disable updater tests on android r=blassey a=bustage-fix

toolkit/mozapps/update/Makefile.in

@@ -49,10 +49,10 @@ XPIDLSRCS = nsIUpdateTimerManager.idl
 EXTRA_PP_COMPONENTS = nsUpdateTimerManager.js nsUpdateTimerManager.manifest
 
 ifdef MOZ_UPDATER
+DIRS = ../readstrings
+
 ifneq ($(OS_TARGET),Android)
-DIRS = ../readstrings \
-  updater \
-  $(NULL)
+DIRS += updater
 endif
 
 XPIDLSRCS += nsIUpdateService.idl