[build] Update last_commit:

Prevent await inside janet_call - address #1531

This was partially implemented before, but not in the case where the
await or other signal itself was created by a C function. We have to
separate code paths for generating signals - one via normal returns in
janet_vm_continue, and the other via longjump. This adds handling for
the longjump case, as well as improved messaging.

last_commit.txt

@@ -1 +1 @@
-83e8aab2897aa2982db48668e85757eef680ea5e
+4daecc9a4113aa0198ddf30c90e59cc256a748d1