treewide: drop shebang from non-executable lib files

This drops the shebang from another bunch of files in various /lib
folders, as these are sourced and the shebang is useless.

Fix execute bit in one case, too.

This should cover almost all trivial cases now, i.e. where /lib is
actually used for library files.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/lantiq/base-files/lib/preinit/05_set_preinit_iface_lantiq

@@ -1,8 +1,5 @@
-#!/bin/sh
-
 set_preinit_iface() {
 	ifname=eth0
 }
 
 boot_hook_add preinit_main set_preinit_iface
-