Revert "fix the mac build"

Alas, April 1st is nearly done. Baaaaaah

This reverts commit 43299c39a8f4f055b23dc7bb9827eebe29da15df.

Change-Id: I600a576de1a751a31a7b32165eb011b37b83e505
bootanim: Add continuous splash support

 * We may or may not want to have a very smooth transition from the
   bootloader into Android by way of a continuous splash feature.
 * Add a compile-time flag which disables the initial screen clearing
   so that we don't drop a frame during the transition.

Change-Id: Ic453c901f1030ffebd9bdbeec59109bb5c585629