linux: Fail as unsupported if personality call is filtered

Container management default seccomp filter [1] only accepts
personality(2) with PER_LINUX, (0x0), UNAME26 (0x20000),
PER_LINUX32 (0x8), UNAME26 | PER_LINUX32, and 0xffffffff (to query
current personality)

Although the documentation only state it is blocked to prevent
'enabling BSD emulation' (PER_BSD, not implemented by Linux), checking
on repository log the real reason is to block ASLR disable flag
(ADDR_NO_RANDOMIZE) and other poorly support emulations.

So handle EPERM and fail as UNSUPPORTED if we can really check for
BZ#19408.

Checked on aarch64-linux-gnu.

[1] https://github.com/moby/moby/blob/master/profiles/seccomp/default.json



Reviewed-by: Florian Weimer <fweimer@redhat.com>