process_io: fix binmode and use it in lei_xsearch

The `binmode' perlop can only take two scalars, so passing
`@_' blindly won't work since prototypes are checked.  This
means we can get IO::Uncompress::Gunzip working properly
with ProcessIO and use it for curl.

We'll also just autodie (instead of warn) on FS errors when
dealing with curl stderr; since the process will likely be
in bigger trouble soon, anyways.

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