Tests: removed http block from mail_smtp_greeting_delay.t.

The test fails when hash tables aren't big enough and there is no way to
propagate new values.
Bonus side-effect: the test will fail if perl module segfault comes back.

mail_smtp_greeting_delay.t

diff --git a/mail_smtp_greeting_delay.t b/mail_smtp_greeting_delay.t
index 05a313f..8944654 100644
--- a/mail_smtp_greeting_delay.t
+++ b/mail_smtp_greeting_delay.t
@@ -44,10 +44,6 @@
     }
 }
 
-http {
-    # stub to avoid SIGSEGV when perl module compiled in, <= 0.7.30
-}
-
 EOF
 
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