makemkv: 1.15.3 -> 1.15.4
makemkv: 1.15.3 -> 1.15.4

Upstream changes:

* Improved hanbdling of disks with mastering errors.
* Seamless joining  of TrueHD streams with overlapping frames.
* Recognizes and converts double-track Dolby Vision MKV files.
* Internal improvements and bugfixes.

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