libvgm
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add licenses
Adds the required license files. The BSD and MIT files follow the templating used in MAME.
libvgm as a whole must be licensed under GPL-2.0-only due to ymf278b.c (you are, of course, free to add more permissive terms for code where you are the copyright holder).
The WonderSwan emulator mentioned in https://github.com/ValleyBell/libvgm/issues/43 is distantly based on Cygne, which was released under GPLv2.