mpd: match the version in the binary for the CI tests

mpd 0.24 aborts in main() when /proc/self/status reports more than one
thread, before it even parses the command line (src/Main.cxx). qemu-user
always reports several, so "mpd --version" cannot run on the emulated CI
targets and the generic version check fails there.

Add test-version.sh matching the version string compiled into the
binary, and drop the two unusable "mpd --version" calls from test.sh,
whose failures it silently ignored anyway.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

sound/mpd/test-version.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# shellcheck shell=busybox
+
+# mpd 0.24 refuses to start when /proc/self/status reports more than one
+# thread before main() runs, which it does under qemu-user, so the binary
+# cannot be asked for its version on the emulated CI targets. Match the
+# version string compiled into it instead.
+case "$1" in
+mpd-full | mpd-mini)
+	grep -aqF "$2" /usr/bin/mpd
+	;;
+mpd-avahi-service)
+	exit 0
+	;;
+*)
+	echo "Untested package: $1" >&2
+	exit 1
+	;;
+esac

sound/mpd/test.sh

@@ -1,12 +1,8 @@
 #!/bin/sh
 
 _mpd_test() {
-	# Version check
-	mpd --version | grep -F "$2"
-
-	# Confirm the binary reports at least one supported output plugin;
-	# "null" is always compiled in and safe for testing.
-	mpd --version | grep -i "null"
+	# Running mpd is not possible on the emulated CI targets, see
+	# test-version.sh; only the init script's shell logic is tested here.
 
 	# Test playlist_directory parsing logic from the init script:
 	# explicit value