Bug 838464 - Define MOZ_BUILD_TIMESTAMP in Fennec Makefile.in. r=gps

mobile/android/base/Makefile.in

@@ -287,6 +287,8 @@ endif
 
 UA_BUILDID=$(shell echo $(ANDROID_VERSION_CODE) | cut -c1-8)
 
+MOZ_BUILD_TIMESTAMP=$(shell echo `$(PYTHON) $(topsrcdir)/toolkit/xre/make-platformini.py --print-timestamp`)
+
 # Mangle our package name to avoid Bug 750548.
 DEFINES += \
   -DMANGLED_ANDROID_PACKAGE_NAME=$(subst fennec,f3nn3c,$(ANDROID_PACKAGE_NAME)) \
@@ -305,6 +307,7 @@ DEFINES += \
   -DMOZ_APP_BASENAME=$(MOZ_APP_BASENAME) \
   -DMOZ_APP_BUILDID=$(MOZ_APP_BUILDID) \
   -DMOZ_APP_ABI=$(TARGET_XPCOM_ABI) \
+  -DMOZ_BUILD_TIMESTAMP=$(MOZ_BUILD_TIMESTAMP) \
   -DMOZ_UPDATER=$(MOZ_UPDATER) \
   $(NULL)