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patch: add hint about mangled whitespace on bad patch

Authored by martinvonz.

Description

patch: add hint about mangled whitespace on bad patch

One of the most common reasons that a patch doesn't apply is because
its whitespace has been mangled (e.g. by their mail client or though
copy&paste). Let's provide a hint about that.

Differential Revision: https://phab.mercurial-scm.org/D11825