add audio

hc

2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

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# Locally calculated after checking pgp signature
sha256  63aede5c6d33b6d9b13511cd0be2cac046f2e70fd0a07aa9573a04a82783af96  m4-1.4.19.tar.xz
# License files, locally calculated
sha256  3972dc9744f6499f0f9b2dbf76696f2ae7ad8af9b23dde66d6af86c9dfb36986  COPYING