Revert "Use newly-provided API level to compare builds."

This reverts commit 81d49f172ea5408612d322cb8a50d8e7029b5ca8.

Conflicts:

	src/com/cyanogenmod/updater/misc/UpdateInfo.java
	src/com/cyanogenmod/updater/service/UpdateCheckService.java

Change-Id: Id60ddc653e6b00ac9256af6114f711d2549d4025