Add missing musl skip for ppc64le builds (backport #1109)

[mergify[bot]]

This is an automatic backport of pull request #1109 done by Mergify.

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[coveralls]

Pull Request Test Coverage Report for Build 8005432321

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.602%

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Totals
Change from base Build 7988719542:	0.0%
Covered Lines:	16746
Relevant Lines:	17335

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💛 - Coveralls