icecast: add SPDX license info per homepage

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
CONTRIBUTING.md: typo in PKG_LICENSE_FILES

Per r33861, it should be PKG_LICENSE and PKG_LICENSE_FILES used for licensing information.

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
misc: correct typo in Makefiles for PKG_LICENSE_FILES

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
lftp: add PKG_LICENSE SPDX information

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
libtheora: add SPDX license information

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
ntpd: add SPDX license information

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
python: use Build/Prepare rule for the config.site file

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Merge pull request #566 from commodo/python-build-prepare

python: use Build/Prepare rule for the config.site file
Merge pull request #563 from antonlacon/license-updates

License updates and metadata typo correction