virtualfilesystem: fix bug with symlinks being ignored

The virtual file system code incorrectly treated symlinks as directories
instead of regular files.  This meant symlinks were not included even if
they are listed in the list of files returned by the core.virtualFilesystem
hook proc.  Fixes #25

Signed-off-by: Ben Peart <Ben.Peart@microsoft.com>

virtualfilesystem.c

@@ -225,7 +225,7 @@ int is_excluded_from_virtualfilesystem(const char *pathname, int pathlen, int dt
 	if (dtype != DT_REG && dtype != DT_DIR && dtype != DT_LNK)
 		die(_("is_excluded_from_virtualfilesystem passed unhandled dtype"));
 
-	if (dtype == DT_REG) {
+	if (dtype == DT_REG || dtype == DT_LNK) {
 		int ret = is_included_in_virtualfilesystem(pathname, pathlen);
 		if (ret > 0)
 			return 0;
@@ -234,7 +234,7 @@ int is_excluded_from_virtualfilesystem(const char *pathname, int pathlen, int dt
 		return ret;
 	}
 
-	if (dtype == DT_DIR || dtype == DT_LNK) {
+	if (dtype == DT_DIR) {
 		if (!parent_directory_hashmap.tablesize && virtual_filesystem_data.len)
 			initialize_parent_directory_hashmap(&parent_directory_hashmap, &virtual_filesystem_data);
 		if (!parent_directory_hashmap.tablesize)