libshout: Update to version 2.4.6

libshout: Update to version 2.4.6

- Update from version 2.4.3 to 2.4.6
- Update of rootfile
- Changelog
    libshout 2.4.6 (20220410)
	* Fixed pkg-config file (#2329)
	* Made vorbis an optional codec
	* Do not pass to small headers to libspeex
	  (see also the same mirror-patch in Icecast)
	* Updated documentation, mostly in regard of making it clearer
	  which functions are now obsoleted
	* General code cleanup
	* Added compiler warnings about obsoleted functions and
	  ignored return values
	* Replaced old shout_set_metadata() with new shout_set_metadata_utf8()
	* Added support for plain text streaming
	* Fixed shout_set_metadata*() sometimes returning SHOUTERR_RETRY (#2328)
	* Workaround old clients by emulating SHOUTERR_RETRY with SHOUTERR_BUSY (#2316)
	* Remove our re-implementation of X509_check_host()
	* Allow to disable building tools (#2331)
    libshout 2.4.5 (20201219)
	* Improved shout.h for reading, and understanding.
	* Marked dumpfile support as obsolete (as SHOUT_PROTOCOL_XAUDIOCAST already is).
	* Added Support for setting the content language.
	* Avoid the use of obsolete functions (#2317).
	* Several small fixes for non-blocking mode (#2321, #2315).
	* Corrected detection of libogg (mostly for windows targets).
	* Now accept TLS mode "auto" when build without TLS support.
	* Added new tool shout(1).
    libshout 2.4.4 (20201001)
	* Fixed handling of blocking/non-blocking mode
	* Fixed ICY port increment
	* Fixed reusing of handles
	* Fixed error handling of Ogg sync layer
	* Fixed Passing of errors between connection and instance layer
	  Without this fix died connections were not correctly detected.
	* Fixed and improved build scripts

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>