[$] System-call wrappers for glibc

In a followup to his session at the2025 Linux Plumbers Conference (LPC), Carlos O'Donell returned to the topicof system-callwrappers for the GNU C library (glibc) at this year's event. This timearound, he was joined by Florian Weimer, who is another glibc maintainer.The idea was to give an update on what has happened over the last year withregard to Linux system calls that lack a glibc wrapper, thus are onlyaccessible viasyscall(). In addition, they wanted to hear from attendees about theirneeds in this area.