Add fmtlib to hwasan-postsubmit. am: be3d771f0c am: c6a4818bc8 am: 0c022da6e7 am: 1424396741

Original change: https://android-review.googlesource.com/c/platform/external/fmtlib/+/2028806

Change-Id: I7ba4655b3aec5237b362f6c9eb7fc2e481150fbc