util/abuild: Remove obsolete FIXME

Change-Id: I51ca0acc18d052f464debaec96154ed07f639355
Signed-off-by: Martin Roth <gaumless@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87377
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>

util/abuild/abuild

@@ -968,7 +968,6 @@ if [[ "${cpus}" != "1" ]]; then
 		cpus=32
 	fi
 	# Test if xargs supports the non-standard -P flag
-	# FIXME: disabled until we managed to eliminate all the make(1) quirks
 	printf "\n" | xargs -P "${cpus:-0}" -n 1 printf "%s\n" 2>/dev/null >/dev/null && USE_XARGS=1
 fi