python3-libarchive-c: add the missing rdepends

Add the missing rdepends to fix below error:
 # python3
 [snip]
 >>> import libarchive
 [snip]
 ModuleNotFoundError: No module named 'ctypes'
 ModuleNotFoundError: No module named 'mmap'

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>