Update Travis, Alpine, and Void build options

- Fallback shell has been removed
 - Built-in watchdog has been renamed

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

contrib/void/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	--enable-watchdog		\
+		 --enable-alsa-utils-plugin	--with-watchdog			\
 		 --with-heading="Void Linux"
 
 echo