Fix three missing global declarations.

Fix compilation without SIGALRM.
It don't link because of remaning alarm(0); call.

Convert engine_id variable to local one

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1342)