[OE-core] Style issue for recipes

[Burton, Ross]

Hi,

Quick question of style for the community to bikeshed on:  in the
general case should recipes be split into foo_1.2.bb and foo.inc, or
should they only split to bb/inc if there are multiple versions and
generally there should just be foo_1.2.bb.

Specifically I'm looking at the libunwind patch for oe-core (moving
from meta-oe) which adds libunwind_1.1.bb and libunwind.inc.
Personally I feel that splitting them up complicates packaging and
should only be done if there's actually multiple versions being used.

Ross