rpm: fix a endian incompatible error in generating tag

rpm: fix a endian incompatible error in generating tag

A flaw was found in the way rpm generating arbitrary tags, which leads to a
incorrect query result, this issue is introduced by a incompatible endianess
when the generating process is executed on different architectures.

This patch resolves it by taking the byte order that host uses.

(From OE-Core rev: b4b79a78012c64e3a19545972512153b1fe64b4d)

Signed-off-by: Ming Liu <ming.liu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>