Restore the zlib / zlib-dynamic logic

The proper logic is that both zlib and zlib-dynamic are disabled by
default and that enabling zlib-dynamic would enable zlib.  Somewhere
along the way, the logic got changed, zlib-dynamic was enabled by
default and zlib didn't get automatically enabled.

This change restores the original logic.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Configure

@@ -339,6 +339,7 @@ our %disabled = ( # "what"         => "comment"
 		  "static-engine"  => "default",
 		  "unit-test"      => "default",
 		  "zlib"           => "default",
+		  "zlib-dynamic"   => "default",
 		  "crypto-mdebug"  => "default",
 		  "heartbeats"     => "default",
 		);
@@ -582,6 +583,10 @@ foreach (@argvcopy)
                         {
                         delete $disabled{"dynamic-engine"};
                         }
+                elsif ($1 eq "zlib-dynamic")
+                        {
+                        delete $disabled{"zlib"};
+                        }
 		my $algo = $1;
 		delete $disabled{$algo};