Remove two -D flags for unused macros.

Change-Id: Ia95b0f0e2003cadd875e84437afa1853c8fe2598
Merge "Remove two -D flags for unused macros."
Fix %hhd formats in the printf family.

Found by adapting the simple unit tests for libc logging to test
snprintf too. Fix taken from upstream OpenBSD without updating
the rest of stdio.

Change-Id: Ie339a8e9393a36080147aae4d6665118e5d93647
Merge "Fix %hhd formats in the printf family."
Merge remote-tracking branch 'aosp/master'