Added the header files dirent.h, unistd.h and utime.h
Add alloca.h, which simply includes malloc.h, which defines alloca().
Signed-off-by: Frank Li <lznuaa@gmail.com> Signed-off-by: Marius Storm-Olsen <mstormo@gmail.com> Acked-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>