Revert "build: Allow building with Oracle JDK 8" ยท CyanogenMod/android_build@cbecec6

Breaks build servers - See DONUTS-13 This reverts commit a097018341040759bbb0e4bdb11e5288d2e536f1. Change-Id: I54269dd783e94621de1ff6fa40db2f582aa90334