fs: fix rmSync error messages for non-ASCII paths #3479

Job	Run time
Build slim tarball	2m 53s
aarch64-linux: with shared libraries	43m 37s
x86_64-darwin: with shared libraries	4h 2m 58s
x86_64-linux: with shared libraries	55m 29s
aarch64-darwin: with shared libraries	55m 12s
	6h 40m 9s

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