Support multiple recovery updater extensions.

Change-Id: I787c086223b674050c0a12fc575add9badb471af
diff --git a/updater/Android.mk b/updater/Android.mk
index e3d62bc..8d731db 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -58,9 +58,9 @@
 $(inc) : $(inc).list
 	$(hide) mkdir -p $(dir $@)
 	$(hide) echo "" > $@
-	$(hide) $(foreach lib,$(libs),echo "extern void Register_$(lib)(void);" >> $@)
+	$(hide) $(foreach lib,$(libs),echo "extern void Register_$(lib)(void);" >> $@;)
 	$(hide) echo "void RegisterDeviceExtensions() {" >> $@
-	$(hide) $(foreach lib,$(libs),echo "  Register_$(lib)();" >> $@)
+	$(hide) $(foreach lib,$(libs),echo "  Register_$(lib)();" >> $@;)
 	$(hide) echo "}" >> $@
 
 $(call intermediates-dir-for,EXECUTABLES,updater)/updater.o : $(inc)