MSVC: Accept tcl86.lib in addition to tcl86t.lib.

ActiveTcl8.6.4.1.299124-win32-x86_64-threaded.exe ships just tcl86.lib.
Back-patch to 9.2, like the commit recognizing tcl86t.lib.

src/tools/msvc/Mkvcbuild.pm

@@ -209,7 +209,7 @@ sub mkvcbuild
 		$pltcl->AddIncludeDir($solution->{options}->{tcl} . '/include');
 		$pltcl->AddReference($postgres);
 
-		for my $tclver (qw(86t 85 84))
+		for my $tclver (qw(86t 86 85 84))
 		{
 			my $tcllib = $solution->{options}->{tcl} . "/lib/tcl$tclver.lib";
 			if (-e $tcllib)