add MacOS ARM64 to CI builds

CMake_modules/FindSndFile.cmake

@@ -0,0 +1,30 @@
+# - Try to find libsndfile
+
+# Use pkg-config to get hints about paths
+find_package(PkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+	pkg_check_modules(LIBSNDFILE_PKGCONF sndfile)
+endif(PKG_CONFIG_FOUND)
+
+# Include dir
+find_path(LIBSNDFILE_INCLUDE_DIR
+	NAMES sndfile.h
+	PATHS ${LIBSNDFILE_PKGCONF_INCLUDE_DIRS}
+)
+
+# Library
+find_library(LIBSNDFILE_LIBRARY
+	NAMES sndfile libsndfile-1
+	PATHS ${LIBSNDFILE_PKGCONF_LIBRARY_DIRS}
+)
+
+find_package(PackageHandleStandardArgs)
+find_package_handle_standard_args(SndFile  DEFAULT_MSG  LIBSNDFILE_LIBRARY LIBSNDFILE_INCLUDE_DIR)
+
+if(SNDFILE_FOUND)
+      add_library(SndFile::sndfile INTERFACE IMPORTED GLOBAL)
+      set_target_properties(SndFile::sndfile PROPERTIES
+        INTERFACE_LINK_LIBRARIES ${LIBSNDFILE_LIBRARY}
+        INTERFACE_INCLUDE_DIRECTORIES ${LIBSNDFILE_INCLUDE_DIR}
+      )
+endif(SNDFILE_FOUND)