[xinetd] upgrade advies

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http://www.xinetd.org/#changes

Gebruikers van oudere versies van xinetd (2.3.0 en ouder) wordt aangeraden een upgrade te doen.

• Applied _many_ security and reliability fixes, see AUDIT. -Solar Designer

Problem Description:

An audit has been performed on the xinetd 2.3.0 source code by Solar
Designer for many different possible vulnerabilities. The 2.3.1
release incorporated his patches into the xinetd source tree. The
audit was very thorough and found and fixed many problems. This xinetd
update includes his audit patch.