contrib: disable bundled watchdog for Alpine builds

In the Alpine reference builds we use 'watchdog' from the BusyBox suite.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

contrib/alpine/build.sh

@@ -17,7 +17,7 @@ PKG_CONFIG_LIBDIR=/usr/lib/pkgconfig:/usr/local/lib/pkgconfig ./configure	\
 		 --prefix=/usr			--exec-prefix=			\
 		 --sysconfdir=/etc		--localstatedir=/var		\
 		 --enable-dbus-plugin		--enable-x11-common-plugin	\
-		 --enable-alsa-utils-plugin	--with-watchdog			\
+		 --enable-alsa-utils-plugin	--without-watchdog		\
 		 --with-keventd			--with-sulogin
 
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