[compiler-rt] Disable QSORT interception on watchOS and tvOS.

Building the sanitizers for watchOS currently fails with
    sanitizer_common_interceptors.inc:9656:8: error: thread-local storage is not supported for the current target
    static THREADLOCAL SIZE_T qsort_size;

I've also speculatively disabled QSORT interception for tvOS to unblock
failing builds. I'll ask someone with more sanitizer knowledge to check
after the holidays.