treewide foris: Makefile polishing
- Fix indentation
- Fix variable PKG_LICENSE_FILES
- Correct SPDX License Identifier
- Remove PKG_UNPACK
- Dont reuse PKG_NAME (more details: https://github.com/openwrt/packages/pull/4119)
Relicense it to GPL-3.0-or-later.
Edited by Josef Schlehofer