helper: list: rename macro clashing with sys/queue.h

helper: list: rename macro clashing with sys/queue.h

The macro named LIST_HEAD() clashed with a macro of same name in
the GNU libc file sys/queue.h.
This causes a warning in MacOS build due to some other system file
including sys/queue.h.

Rename LIST_HEAD() as OOCD_LIST_HEAD().

Checkpatch-ignore: MACRO_ARG_REUSE
Change-Id: Ic653edec77425a58251d64f56c9f5f6c645ba0cd
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reported-by: Andrew Shelley <ashelley@btinternet.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8683
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Andy <andrewjohnshelley@gmail.com>