signal/compat: Remove compat_sigset_t override

x86 no longer uses compat_sigset_t when CONFIG_COMPAT isn't enabled, so
remove the override define.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Link: https://lore.kernel.org/r/20220606203802.158958-4-brgerst@gmail.com


Signed-off-by: Borislav Petkov <bp@suse.de>