stagefright-plugins: Add flag to disable inclusion
stagefright-plugins: Add flag to disable inclusion

Change-Id: I9dce3f4b39835582af4b8c29ff34476501802800

XPerience-AOSP-Lollipop/android_external_stagefright-plugins,XPerience-AOSP-Lollipop/android_external_stagefright-plugins