linux-yocto/6.4: fix menuconfig

linux-yocto/6.4: fix menuconfig

Integrating the following commit(s) to linux-yocto/6.4:

    Author: Bruce Ashfield
    Email: bruce.ashfield@gmail.com
    Subject: mconf: fix output of cflags and libraries
    Date: Mon, 17 Jul 2023 17:17:55 -0400

    commit 3122c84409d578a5df8bcb1 [kconfig: refactor Makefile to reduce
    process forks] changes the way that flags are detected. They are
    no longer just echo'd and captured, they are written to a file and
    later read.

    We adjust our CROSS ncurses patch accordingly.

    We'll eventually be able to drop this patch, but not quite yet.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>