kbuild: fix unportability in gen_initramfs_list.sh

On a Mac OS X machine the output of ls -l is different from a standard
Linux machine. Use readlink instead of parsing a hardcoded field number
from the ls output.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/gen_initramfs_list.sh b/scripts/gen_initramfs_list.sh
index 684fb9c..5f3415f 100644
--- a/scripts/gen_initramfs_list.sh
+++ b/scripts/gen_initramfs_list.sh
@@ -135,7 +135,7 @@
 			str="${ftype} ${name} ${str} ${dev} ${maj} ${min}"
 			;;
 		"slink")
-			local target=`field 11 $(LC_ALL=C ls -l "${location}")`
+			local target=`readlink "${location}"`
 			str="${ftype} ${name} ${target} ${str}"
 			;;
 		*)