* gnu/packages/mp3.scm (ripperx): Update to 2.8.0. Drop one patch and
add another one.
* gnu/packages/patches/ripperx-libm.patch: Remove file.
* gnu/packages/patches/ripperx-missing-file.patch: New file.
* gnu-system.am (dist_patch_DATA): Register one patch and unregister the
other.
