Add missing stdbool include for C compat.

Bug: https://github.com/android/ndk/issues/1920
Test: clang --sysroot out/soong/ndk/sysroot
          out/soong/ndk/sysroot/usr/include/**/*.h

Change-Id: Ic93ef129ae3c2014435699dcdca56215bdb00d59
1 file changed