Remove the riff-test-util from the packaging #738

Job	Run time
Build macOS (x86_64)	31m 27s
Build macOS (arm64)	33m 34s
Ubuntu 20.04 AppImage (x86_64)	27m 5s
Ubuntu 20.04 AppImage (x86_64, gcc 11)	24m 43s
Ubuntu 22.04 AppImage (x86_64)	24m 18s
Source Tarball	3m 34s
Windows MSVC 2019 (x86)	22m 24s
Windows MSVC 2019 (x86_64)	21m 59s
Windows MSVC 2022 (x86)	22m 59s
Windows MSVC 2022 (x86_64)	21m 35s
Package macOS (x86_64, arm64, universal)	7m 32s
	4h 1m 10s

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