fix for .c files in msw subdir for VC++ 6

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3857 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

distrib/msw/tmake/vc6.t

@@ -27,7 +27,9 @@
     foreach $file (sort keys %wxMSW) {
         next if $wxMSW{$file} =~ /\b16\b/;
 
-        my $tag = $wxMSW{$file} =~ /\bO\b/ ? "WXOLESRCS" : "WXMSWSRCS";
+        my $tag;
+	if ( $wxMSW{$file} =~ /\bO\b/ ) { $tag = "WXOLESRCS" }
+	else { $tag = $file =~ /\.c$/ ? "WXCSRCS" : "WXMSWSRCS" }
         $project{$tag} .= $file . " "
     }