shairport-sync: update to latest version

- update to latest (2.4.1) version
- add support for config files
- switch uci to config files
- based on https://github.com/openwrt/packages/pull/1815
- merge maintainers
- add openssl/polarssl build variants

Signed-off-by: Mike Brady <mikebrady@eircom.net>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

sound/shairport-sync/files/shairport-sync.config

@@ -1,35 +1,53 @@
-# Uncomment the stanza you want, and make sure to comment out the others, especially duplicate options.
+# Use your own config file
+config shairport-sync 'shairport_sync_file'
+	option disabled '1'
+	option respawn '1'
+	option conf_custom '1'
+	option conf_file '/etc/shairport-sync.conf'
 
-#Arguments and defaults are as follows
-config shairport-sync main
-#       option name 'Shairport Sync' 		#default name, "Shairport Sync on %d"
-#       option device default        		#default soundcard, volume control by software
-						#(Troubleshooting hint: make sure the soundcard's volume is turned up fully -- use alsamixer or amixer)
-#       option airplaylatency 88200
-#       option ituneslatency 99400
-#       option port 5000
-#       option stuffing basic 			#options are 'basic' or 'soxr' if shairport-sync was compiled with soxr support
-#       option awaitactioncompletion false 	#[don't] wait until beforeaction or afteraction completes
-#       option beforeaction <action> 		#action must be a fully qualified program with no arguments. Default no action.
-#       option afteraction <action> 		#action must be a fully qualified program with no arguments. Default no action.
-#       option devicetype <devicetype>
-#       option volumecontrolname <name>
-
-#Here are some sample stanzas:
-
-#For Raspberry Pi using the built-in soundcard for the headphone jack
-#       option device 'hw:0'
-#       option devicetype hardware
-#       option volumecontrolname Master
-
-#For Raspberry Pi with the "3D Sound" USB Soundcard
-#        option name 'Pi'
-#        option device 'hw:1'
-#        option devicetype hardware
-#        option volumecontrolname Speaker
-
-#For Raspberry Pi with the first generation iMic or the Topping TP30 Class T Digital Mini Amplifier
-#        option name 'Kitchen'
-#        option device 'hw:1'
-#        option devicetype hardware
-#        option volumecontrolname PCM
+# Use OpenWrt UCI config
+config shairport-sync 'shairport_sync'
+	option disabled '1'
+	option respawn '1'
+	# General
+	option name 'Shairport-Sync'
+	option password ''
+	option interpolation '' # basic/soxr
+	option output_backend '' # alsa/pipe/stdout/ao/dummy/pulse/sndio
+	option mdns_backend '' # avahi/external-avahi/dns-sd/external-dns-sd/tinysvcmdns
+	option port '' # 5000
+	option udp_port_base '' # 6001
+	option udp_port_range '' # 100
+	option statistics '' # no/yes
+	option drift '' # 88
+	option resync_threshold '' # 2205
+	option log_verbosity '' # 0/1/2/3
+	option ignore_volume_control '' # no/yes
+	# Latencies
+	option latencies_default '' # 88200
+	option latencies_itunes '' # 99400
+	option latencies_airplay '' # 88200
+	option latencies_forked_daapd '' # 99400
+	# Metadata
+	option metadata_enabled '' # no/yes
+	option metadata_cover_art '' # no/yes
+	option metadata_pipe_name '' # /tmp/shairport-sync-metadata
+	# Session Control
+	option sesctl_run_before_play_begins '' # /etc/shairport-sync-start.sh
+	option sesctl_run_after_play_ends '' # /etc/shairport-sync-stop.sh
+	option sesctl_wait_for_completion '' # no/yes
+	option sesctl_session_interruption '' # no/yes
+	option sesctl_session_timeout '' # 120
+	# ALSA
+	option alsa_output_device '' # default
+	option alsa_mixer_control_name '' # PCM
+	option alsa_mixer_device '' # default
+	option alsa_latency_offset '' # 0
+	option alsa_buffer_length '' # 6615
+	# Pipe
+	option pipe_name '' # /tmp/shairport-sync-audio
+	option pipe_latency_offset '' # 0
+	option pipe_buffer_length '' # 44100
+	# Stdout
+	option stdout_latency_offset '' # 0
+	option stdout_buffer_length '' # 44100