local: new flag --local-zero-size-links to fix sync on some virtual filesystems

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Assume the Stat size of links is zero (and read them instead)

On some virtual filesystems (such ash LucidLink), reading a link size via a
Stat call always returns 0.
However, on unix it reads as the length of the text in the link. This may
cause errors like this when syncing:

    Failed to copy: corrupted on transfer: sizes differ 0 vs 13

Setting this flag causes rclone to read the link and use that as the size of
the link instead of 0 which in most cases fixes the problem.

Fixes #4950

Signed-off-by: Riccardo Iaconelli <riccardo@kde.org>

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