extract_utils: Fallback to odex if vdex fails and simplify loop

Seems that the vdex header changed in Pie and oatdump wasn't updated.
Work around that by falling back to vdex, and simplify the loop.

Change-Id: I1c6411c8d29cce4aa178af98fa80362cfc6568e7
Signed-off-by: Joe Maples <joe@frap129.org>

Conflicts:
	build/tools/extract_utils.sh
1 file changed