[compiler-rt] Suppress -Wunused-result due to ::write when _FORTIFY_SOURCE>0 in glibc am: 6712ba9c9c

Original change: https://android-review.googlesource.com/c/platform/external/scudo/+/1486457

Change-Id: I0324ca21158a8bf78823bc00dc6187d6a3b564b2