kbuild: Fix ld-version.sh script if LLD was built with LLD_VENDOR

If LLD was built with -DLLD_VENDOR="xyz", ld.lld --version output
will prefix LLD_VENDOR. Since LLD_VENDOR can contain spaces, the
LLD identifier isn't guaranteed to be $2 either.

Adjust the version checker to handle such versions of lld.

Link: https://lore.kernel.org/lkml/20210302221211.1620858-1-bero@lindev.ch/
Signed-off-by: Bernhard Rosenkränzer <bero@lindev.ch>
[masahiro yamada: refactor the code]
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>

scripts/ld-version.sh

@@ -44,14 +44,20 @@ if [ "$1" = GNU -a "$2" = ld ]; then
 elif [ "$1" = GNU -a "$2" = gold ]; then
 	echo "gold linker is not supported as it is not capable of linking the kernel proper." >&2
 	exit 1
-elif [ "$1" = LLD ]; then
-	version=$2
-	min_version=$lld_min_version
-	name=LLD
-	disp_name=LLD
 else
-	echo "$orig_args: unknown linker" >&2
-	exit 1
+	while [ $# -gt 1 -a "$1" != "LLD" ]; do
+		shift
+	done
+
+	if [ "$1" = LLD ]; then
+		version=$2
+		min_version=$lld_min_version
+		name=LLD
+		disp_name=LLD
+	else
+		echo "$orig_args: unknown linker" >&2
+		exit 1
+	fi
 fi
 
 # Some distributions append a package release number, as in 2.34-4.fc32