Fix globbing issue in lbmk

When doing e.g. $@ we should use double quotes to prevent globbing.

Thanks go to XRevan86 for pointing this out.

Signed-off-by: Leah Rowe <leah@libreboot.org>

script/trees

@@ -294,6 +294,6 @@ copy_elf()
 	done < "$listfile"; x_ make clean -C "$srcdir" $cleanargs
 }
 
-main $@ || exit 0
+main "$@" || exit 0
 . "$mkhelpercfg"
 $cmd