Simplify bool parsing am: 8aa7e9be3e am: 631fdff301 am: f9ec45d890 am: fd38ffa5b3 am: 1820e1765e am: 802bf1f1a9

Original change: https://android-review.googlesource.com/c/platform/system/librustutils/+/2571571

Change-Id: I593d128fc3a85df0cc3a2d90d1f099a828806bab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>