utils: fix cpubind support checks

(cherry picked from commit e8d3ccda4e346821de6497fa7059d5a3cb755d2a)
hwloc.h: Fix proc_cpubind() proc_last_cpu_location() documentation when using Linux TID

and document that hwloc_linux_*_tid_cpubind() are equivalent.

(cherry picked from commit f32d07ab8cf60076f3924073a38c12737676a9dd)