eglibc: Move perl- and bash-using scripts to separate recipes

eglibc: Move perl- and bash-using scripts to separate recipes

This removes the dependency of eglibc.bb itself on perl and bash
which, in turn, eliminates the need to build those two recipes if the
scripts which need them are not going to be installed.

Also provide dummy do_evacuate_scripts() for all variants of eglibc-initial
otherwise the nativesdk and multilib variants might crash trying to
copy a non-existent mtrace script.

(From OE-Core rev: 74b5f8943b2b29c7b3b62be7d81fb2b3a86b9584)

Signed-off-by: Phil Blundell <pb@pbcl.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>