glibc 2.30 introduced the function gettid() in sys/types.h to return the caller's thread ID. In order to avoid conflicts, the already present gettid() functions have been renamed to sysGettid(). This fixes a compilation error with X86 arch. Change-Id: I76c971465fc4b50e4decde8303185439082b2378 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21379 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu> Maintainer: Jason Lowe-Power <jason@lowepower.com> Tested-by: kokoro <noreply+kokoro@google.com>