Support fuzzy name matching Tune with confENVDEF

Defining MATCHGECOS causes code to be included inside sendmail for support of limited fuzzy name matching. This process is described under the MatchGECOS option (MatchGECOS on page 1043). This MATCHGECOS compile-time macro is normally defined as true by default. If you want to turn it off, use an expression such as this in your Build m4 file:

                             disable fuzzy name matching inside sendmail

If you are running a precompiled sendmail binary, you can use the -d0.1 debugging command-line switch (-d0.1 on page 542) to determine whether MATCHGECOS support is included (if it appears in the list, support is included).

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