Log Message:
libsndfile: Update to 0.2.1

Version 0.2.1 (2021-01-23)
  * Fix incorrect passing of -version-info to libtool, causing a
    regression on versioned file name of the shared library (#140).
  * Fix time resolution on GNU/Hurd for throughput_test
  * Update AUTHORS and release manager details

Version 0.2.0 (2021-01-21)
  * API:
    * Add `src_clone()` function to clone a SRC_STATE* handle
  * Cleanup Autotools build system.
  * Require C99 compiler
  * Move `sndfile-resample` to sndfile-tools package
  * Add missing `src_get_channels`() export to windows def file
  * Fix macOS compile errors and modernize audio api on that platform
  * Add Octave scripts to generate filter coefficients
  * Fix two potential undefined behaviours
  * Fix a buffer out-of-bounds read error in src/src_sinc.c
  * Improve multichan_throughput_test
  * Replace buggy implementationg of Duffs device by regular loop
  * CMake:
    * Fix CMake generated shared library ABI compliance with Autotools build
  * Documentation:
    * Move site to new URL: http://libsndfile.github.io/libsamplerate/
    * Convert documentation pages from HTML to Markdown
    * Use GitHub's Jekyll static site generator to generate static HTML pages
      for site