[SoX/Flac] disable xmms_plugin dependency (#3436)

Summary:
This plugin pulls glib and gtk which breaks the build on some headless systems

Since the plugin is not actually used, it seems right to disable it

This change fixed the build on my system

Pull Request resolved: https://github.com/pytorch/audio/pull/3436

Differential Revision: D46683297

Pulled By: mthrok

fbshipit-source-id: 5b1c1eee1929f4a69a1cc6c7d7bb3ed998ec5872

third_party/sox/CMakeLists.txt

@@ -75,7 +75,7 @@ ExternalProject_Add(flac
   URL https://ftp.osuosl.org/pub/xiph/releases/flac/flac-1.3.2.tar.xz
   URL_HASH SHA256=91cfc3ed61dc40f47f050a109b08610667d73477af6ef36dcad31c31a4a8d53f
   PATCH_COMMAND cp ${patch_dir}/config.guess ${patch_dir}/config.sub ${CMAKE_CURRENT_BINARY_DIR}/src/flac/
-  CONFIGURE_COMMAND ${CMAKE_COMMAND} -E env ${envs} ${CMAKE_CURRENT_BINARY_DIR}/src/flac/configure ${COMMON_ARGS} --with-ogg --disable-cpplibs
+  CONFIGURE_COMMAND ${CMAKE_COMMAND} -E env ${envs} ${CMAKE_CURRENT_BINARY_DIR}/src/flac/configure ${COMMON_ARGS} --with-ogg --disable-cpplibs --disable-xmms-plugin
   DOWNLOAD_NO_PROGRESS ON
   LOG_DOWNLOAD ON
   LOG_UPDATE ON