Hi All,

This patch fixes the issue where nosys.specs is used to link.
e.g. The use of crt0 without any support for semihosting requested.

The AArch64 crt0 was missing an #ifdef for the initialise_monitor_handles
which was causing the link to fail. Sorry for missing this before.

Ok for master?

PS. I don't have commit access so if OK can someone apply?

Thanks,
Tamar