PR16207 partial fix: Fix the access [nd_]syscall.exp tests on rawhide.

PR16207 partial fix: Fix the access [nd_]syscall.exp tests on rawhide.

* tapset/linux/syscalls.stpm: Add @__syscall_compat_gate() macro.
* tapset/linux/syscalls.stp: Add @__syscall_compat_gate() macro call to
  syscall.faccessat and syscall.faccess.return.
* tapset/linux/nd_syscalls.stp: Add @__syscall_compat_gate() macro call to
  nd_syscall.faccessat and nd_syscall.faccess.return.
* testsuite/systemtap.syscall/access.c: Updated testcase to handle
  access() no longer being a wrapper around faccessat().
* runtime/linux/compat_unistd.h: New file.
* tapset/linux/aux_syscalls.stp: Include compat_unistd.h.