[oe] per-package extra packaging hooks

[Phil Blundell]

The attached patch implements a mechanism for packages to inject python
code into the packaging process of their dependents.  In particular this
will make it possible to implement a correct fix for the ongoing libgcc
dependency issue without having to pile a load of libc-specific code
into package.bbclass.  More generally, it allows the packaging code to
become more decentralised and removes the need to hack on
package.bbclass itself (with the attendant disruption and risk of merge
conflicts) whenever package-specific code needs to be added or modified.

Comments and suggestions welcome.

p.

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