tar: Add TypeChar, TypeBlock and TypeFifo header flags support

Character devices, block devices and named pipes have the separate
types, but at the same time they can be extracted like the other
files and they're handled well by archive/tar library. Supporting
these headers is necessary for extracting Linux rootfs archives.

tar.go

@@ -204,7 +204,7 @@ func untarFile(tr *tar.Reader, header *tar.Header, destination string) error {
 	switch header.Typeflag {
 	case tar.TypeDir:
 		return mkdir(filepath.Join(destination, header.Name))
-	case tar.TypeReg, tar.TypeRegA:
+	case tar.TypeReg, tar.TypeRegA, tar.TypeChar, tar.TypeBlock, tar.TypeFifo:
 		return writeNewFile(filepath.Join(destination, header.Name), tr, header.FileInfo().Mode())
 	case tar.TypeSymlink:
 		return writeNewSymbolicLink(filepath.Join(destination, header.Name), header.Linkname)