Protect client control socket from SIGPIPE #505

Job	Run time
sanitize-prepare	2s
sanitize-prepare	2s
check (--enable-debug)	1m 6s
check (--enable-debug)	1m 6s
check (--enable-debug --enable-aac --enable-msbc)	1m 9s
check (--enable-debug --enable-aac --enable-msbc)	1m 9s
check (--enable-debug --enable-mp3lame --enable-mpg123)	53s
check (--enable-debug --enable-mp3lame --enable-mpg123)	53s
check (--enable-faststream --enable-mp3lame)	57s
check (--enable-faststream --enable-mp3lame)	57s
check (--enable-aplay --enable-ofono --enable-upower)	51s
check (--enable-aplay --enable-ofono --enable-upower)	51s
check (--enable-cli --enable-rfcomm --enable-manpages)	56s
check (--enable-cli --enable-rfcomm --enable-manpages)	56s
sanitize (address alignment bool bounds nonnull-attribute shift undefined)	1m 36s
sanitize (address alignment bool bounds nonnull-attribute shift undefined)	2m 4s
sanitize (thread)	1m 57s
sanitize (thread)	1m 57s
	19m 22s

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