enna: Move to own recipe folder and update to new Enna hg repository.

enna: Move to own recipe folder and update to new Enna hg repository.

1. Create `enna.inc`.
2. Use `INC_PR`.
3. Move to new repository location.
4. Update license to LGPLv2.1+.
5. Build tested with GCC 4.4.3 and Binutils 2.20.1 for `MACHINE = "beagleboard".
6. Build tested with GCC 4.3.3 and Binuitls 2.18.50 for `MACHINE = "beagleboard".
7. Remove `dbus` from `DEPEND` since `edbus` already depends an it.
8. `libmusicbrainz`, `lightmediascanner` and `taglib` are not needed anymore as `DEPENDS`.
9. `do_configure_prepend()` fixes [1]. Thanks Koen.
10. libvalhalla 2.0.0 (`libvalhalla_hg.bb`) is needed for this version.

[1] http://lists.linuxtogo.org/pipermail/openembedded-devel/2010-March/018800.html

Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>