Indicate to the kernel, that we won't be needing the zone dumps

Add a call to posix_fadvise() to indicate to the kernel, that `named`
won't be needing the dumped zone files any time soon with:

 * POSIX_FADV_DONTNEED - The specified data will not be accessed in the
   near future.

Notes:

 POSIX_FADV_DONTNEED attempts to free cached pages associated with the
 specified region. This is useful, for example, while streaming large
 files. A program may periodically request the kernel to free cached
 data that has already been used, so that more useful cached pages are
 not discarded instead.

(cherry picked from commit 2a5917e5)
79 jobs for !5106 with ondrej/rewrite-masterdump-to-uv-threadpool-v9_16 in 37 seconds (queued for 33 seconds)
latest detached
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failed
msvc:windows:amd64 Build
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