[v3] Fix libstdc++/8610

[Paolo Carlini]

Hi,

the below is what I'm going to commit.

Regression tested both LFS and not-LFS (by hand) on i686-pc-linux-gnu,
x86_64-unknown-linux-gnu, powerpc-unknown-linux-gnu + passed some
basic large file tests on all of the above (*).

Paolo.

(*) x86_64, being actually a 64 bit architecture, passes those tests
also as is.

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