fs: fix rmSync error messages for non-ASCII paths #1963

Job	Run time
Build slim tarball	1m 32s
aarch64-linux: with shared libraries	24m 56s
aarch64-darwin: with shared libraries	26m 4s
x86_64-darwin: with shared libraries	36m 42s
x86_64-linux: with shared libraries	28m 20s
	1h 57m 34s

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