all_syscalls: don't hardcode AWK invocation

all_syscalls: don't hardcode AWK invocation

Use the buildsystem to find a usable awk implementation and use that.

Reported-by: Firas Khalil Khana <firasuke@gmail.com>
Link: https://github.com/util-linux/util-linux/pull/2949
Reported-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
https://lore.kernel.org/util-linux/31ccace2e5912ffc428e065cd66764088c625c4d.camel@physik.fu-berlin.de/
Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
(cherry picked from commit 543f991f62659b9a3ff67f9cda3456b2a5bb3f98)