Log Message:
libxspf: Update to 1.2.1

2021-05-29 -- 1.2.1

  * Fixed: GCC 4.4 test suite compilation
      Thanks to Samuli Suominen for the patch!
  * Fixed: Missing unistd.h include in
      examples/read/read.cpp
  * Fixed: Compile errors when uriparser is located in a
      non-standard path that is passed to configure through
      variable PKG_CONFIG_PATH
  * Fixed: Update the GNU Autotools build system
      so that ./autogen.sh runs without warnings
  * Fixed: Allow linking with LLD
  * Improved: Modernize the GNU Autotools build system
      Thanks to David Seifert for the pull request!
  * Soname: 4:3:0 (please see https://verbump.de/
                   for what these numbers do)