regen/reentr.pl: Remove duplicate line

Only need to set a hash entry once to the same value

Author: khwilliamson

regen/reentr.pl

@@ -489,7 +489,6 @@ sub define {
                         asctime   => 26,
                         ctime     => 26,
                         setlocale => "REENTRANTSMALLSIZE",
-                        getlogin  => "REENTRANTSMALLSIZE",
 
                         # POSIX specifies that the symbol LOGIN_NAME_MAX gives
                         # this value; but not all systems have that;