lib/package: Check incompatible licenses at packaging time

lib/package: Check incompatible licenses at packaging time

Instead of checking for incompatible licenses in the anonymous python
and setting '_exclude_incompatible-', (re)check all the packages in
populate_packages(). This ensures that all packages are processed, even
dynamically generated ones.

The use of the '_exclude-incompatible-' variable set in base.bbclass has
been the mechanism used for per-packages licenses since it was added as
a feature (although with different names for the variable throughout
history). However, since this misses dynamic packages, calling
oe.license.skip_incompatible_package_licenses() a second time on the
actual final package set is a better solution.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>