Minor tweaks to linux compat

[pstef]

Summary

linux(4): silence attempts to get/set huge pages

 sys/compat/linux/linux_misc.c | 6 ++++++
 sys/compat/linux/linux_misc.h | 2 ++
 2 files changed, 8 insertions(+)

linux(4): ignore statx sync flags

 sys/compat/linux/linux_file.h  | 6 ++++++
 sys/compat/linux/linux_stats.c | 4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)

linux(4): add fchmodat2

 sys/amd64/linux/syscalls.master   |  9 +++++++--
 sys/amd64/linux32/syscalls.master |  9 +++++++--
 sys/arm64/linux/syscalls.master   |  9 +++++++--
 sys/compat/linux/linux_dummy.c    |  2 --
 sys/compat/linux/linux_file.c     | 19 +++++++++++++++++++
 sys/i386/linux/syscalls.master    |  9 +++++++--
 6 files changed, 47 insertions(+), 10 deletions(-)

linux(4): regen after linux_fchmodat2

 sys/amd64/linux/linux_proto.h             |  7 +++++--
 sys/amd64/linux/linux_sysent.c            |  2 +-
 sys/amd64/linux/linux_systrace_args.c     | 26 +++++++++++++++++++++++++-
 sys/amd64/linux32/linux32_proto.h         |  7 +++++--
 sys/amd64/linux32/linux32_sysent.c        |  2 +-
 sys/amd64/linux32/linux32_systrace_args.c | 26 +++++++++++++++++++++++++-
 sys/arm64/linux/linux_proto.h             |  7 +++++--
 sys/arm64/linux/linux_sysent.c            |  2 +-
 sys/arm64/linux/linux_systrace_args.c     | 26 +++++++++++++++++++++++++-
 sys/i386/linux/linux_proto.h              |  7 +++++--
 sys/i386/linux/linux_sysent.c             |  2 +-
 sys/i386/linux/linux_systrace_args.c      | 26 +++++++++++++++++++++++++-
 12 files changed, 124 insertions(+), 16 deletions(-)