v2writable: git_hash_raw: avoid $TMPDIR write

We can rely on FD_CLOEXEC being set by default (since Perl 5.6+)
on pipes to avoid FS/page-cache traffic, here.  We also know
"git hash-object" won't output anything until it's consumed all
of its standard input; so there's no danger of a deadlock even
in the the unlikely case git uses a hash that can't fit into
PIPE_BUF :P

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