meson: fix SPDX license identifier
There is no such license as GPL-2 in the SPDX nomenclature. As the project is licensed under GNU General Public License v2.0 or later, use the related identifier GPL-2.0-or-later.
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There is no such license as GPL-2 in the SPDX nomenclature. As the project is licensed under GNU General Public License v2.0 or later, use the related identifier GPL-2.0-or-later.