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

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

Change-Id: I15837e22f158285240cb8909e0e12767bcbadcb1