openssl: regenerate asm files for openssl 1.0.1e
crypto: clear error stack

Clear OpenSSL's error stack on return from Connection::HandleSSLError().
This stops stale errors from popping up later in the lifecycle of the
SSL connection where they would cause spurious failures.

This commit causes a 1-2% performance regression on `make bench-tls`.
We'll address that in follow-up commits if possible but let's ensure
correctness first.

Fixes #4771.
core: Mark exit() calls with status codes

Also, exit with 128+n for signal exit n, as is The Unix Way.
core: Remove the nextTick for running the main file

Not necessary, since we can handle the error properly on the first tick
now, even if there are event listeners, etc.