[klibc] sparc: Set sa_restorer for signals and disable executable stack

[klibc] sparc: Set sa_restorer for signals and disable executable stack

Origin: https://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=05350b72cace18417c1ba00c4796a5e19ebb908b

sparc allows specifiying a signal restorer in the usual way.  We
should do this to avoid needing an executable stack.

* Define a __sigreturn() routine that calls rt_sigreturn
* Force the SA_RESTORER flag on for all signal handlers, and set
  __sigreturn as the restorer if none is already set
* Force the SA_SIGINFO flag on for all signal handlers, so that we can
  always return from them with rt_sigreturn
* Set KLIBCEXECSTACK=n

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Gbp-Pq: Name 0005-klibc-sparc-Set-sa_restorer-for-signals-and-disable-.patch