Fix obsolete config-module-exclusion logic in vcregress.pl.

The recent addition of regression tests to uuid-ossp exposed the fact
that the MSVC build system wasn't being consistent about whether it was
building/testing that contrib module, ie, it would try to test the module
even when it hadn't built it.  The same hazard was latent for sslinfo.

For the moment I just copied the more up-to-date logic from point A to
point B, but this is screaming for refactoring.

Per buildfarm results.

src/tools/msvc/Install.pm

@@ -408,6 +408,7 @@ sub CopyContribFiles
 		next
 		  if ($insttype eq "client" && !grep { $_ eq $d } @client_contribs);
 
+		# these configuration-based exclusions must match vcregress.pl
 		next if ($d eq "uuid-ossp" && !defined($config->{uuid}));
 		next if ($d eq "sslinfo"   && !defined($config->{openssl}));
 		next if ($d eq "xml2"      && !defined($config->{xml}));

src/tools/msvc/vcregress.pl

@@ -219,8 +219,12 @@ sub contribcheck
 	my $mstat = 0;
 	foreach my $module (glob("*"))
 	{
-		next if ($module eq 'sepgsql');
-		next if ($module eq 'xml2' && !$config->{xml});
+		# these configuration-based exclusions must match Install.pm
+		next if ($module eq "uuid-ossp" && !defined($config->{uuid}));
+		next if ($module eq "sslinfo"   && !defined($config->{openssl}));
+		next if ($module eq "xml2"      && !defined($config->{xml}));
+		next if ($module eq "sepgsql");
+
 		next
 		  unless -d "$module/sql"
 			  && -d "$module/expected"