mp3diags: Upgrade to unstable tarball 1.5.01

This upgrade switches qt4 to qt5.

UPSTREAM CHANGELOG
==================

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06.04.2019 - 1.5.01
- Qt5 port

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29.07.2016 - 1.3.04
- made code compile with GCC 6
- retries on file read failure
- fix for UTF8 output in calls to mp3gain (Linux only)
- new transformation: "Remove Xing or LAME streams from CBR files"
- always show sessions button if there are more than 1 sessions

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08.03.2015 - 1.3.03
- improved error reporting
- speed improvements for external drives (USB, network, ...)
- different treatment for the Xing frame being included in the frame count

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17.07.2014 - 1.3.01
- fixed crash caused by saving very small images
- build fix
- disabled Discogs integration

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16.01.2014 - 1.3.00
- build fix for clang and for Solaris
- added offset to the output created via the command line
- fixed incorrect message occurring some times when start after a crash
- better logging and retries for write errors
- fixed broken links in documentation and moved alternate downloads
    from Dropbox to my ISP
- new version number to support the new "unstable" branch

(kamil)