update OpenAL-Soft to 1.24.3.

libs/openal-soft/cmake/FindSndIO.cmake

@@ -0,0 +1,31 @@
+# - Find SndIO includes and libraries
+#
+#   SNDIO_FOUND        - True if SNDIO_INCLUDE_DIR & SNDIO_LIBRARY are found
+#   SNDIO_LIBRARIES    - Set when SNDIO_LIBRARY is found
+#   SNDIO_INCLUDE_DIRS - Set when SNDIO_INCLUDE_DIR is found
+#
+#   SNDIO_INCLUDE_DIR - where to find sndio.h, etc.
+#   SNDIO_LIBRARY     - the sndio library
+#
+
+find_path(SNDIO_INCLUDE_DIR
+          NAMES sndio.h
+          DOC "The SndIO include directory"
+)
+
+find_library(SNDIO_LIBRARY
+             NAMES sndio
+             DOC "The SndIO library"
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(SndIO
+    REQUIRED_VARS SNDIO_LIBRARY SNDIO_INCLUDE_DIR
+)
+
+if(SNDIO_FOUND)
+    set(SNDIO_LIBRARIES ${SNDIO_LIBRARY})
+    set(SNDIO_INCLUDE_DIRS ${SNDIO_INCLUDE_DIR})
+endif()
+
+mark_as_advanced(SNDIO_INCLUDE_DIR SNDIO_LIBRARY)