fs: fix rmSync error messages for non-ASCII paths #1964

Job	Run time
Build slim tarball	1m 29s
x86_64-linux: with shared libraries	28m 57s
aarch64-darwin: with shared libraries	26m 26s
x86_64-darwin: with shared libraries	50m 20s
aarch64-linux: with shared libraries	24m 10s
	2h 11m 22s

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