* gdbarch.sh (skip_solib_resolver): Change into a multi-arch

* gdbarch.sh (skip_solib_resolver): Change into a multi-arch
function.
* gdbarch.c, gdbarch.h: Regenerate.
* infrun.c (handle_inferior_event): Call
gdbarch_skip_solib_resolver instead of SKIP_SOLIB_RESOLVER.
* arch-utils.c (generic_in_solib_call_trampoline): Adjust function
definition.
* arch-utils.h (generic_in_solib_call_trampoline): Adjust function
prototype.