Backport two patches from upstream:
use new readline function types (closes#20374)
Issue #20374: Avoid compiler warnings when compiling readline with libedit.
[YOCTO #6107]
(From OE-Core rev: a6b91ae7dec2edebc0eaea0592c42b1c455ad4d7)
Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>