Import xiph/opusfile @ 4174c26e0aaab19d01afdea0a46f7f95fdc6b3e6HEADmaster

Snapshot for re3/reVC vendoring, per @lzcnt.
Source: https://github.com/xiph/opusfile (4174c26e0aaab19d01afdea0a46f7f95fdc6b3e6).

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+# Opusfile
+
+[![GitLab Pipeline Status](https://gitlab.xiph.org/xiph/opusfile/badges/master/pipeline.svg)](https://gitlab.xiph.org/xiph/opusfile/commits/master)
+[![Travis Build Status](https://travis-ci.org/xiph/opusfile.svg?branch=master)](https://travis-ci.org/xiph/opusfile)
+[![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/github/xiph/opusfile?branch=master&svg=true)](https://ci.appveyor.com/project/rillian/opusfile)
+
+The opusfile and opusurl libraries provide a high-level API for
+decoding and seeking within .opus files on disk or over http(s).
+
+opusfile depends on libopus and libogg.
+opusurl depends on opusfile and openssl.
+
+The library is functional, but there are likely issues
+we didn't find in our own testing. Please give feedback
+in #opus on irc.freenode.net or at [email protected].
+
+Programming documentation is available in tree and online at
+https://opus-codec.org/docs/