Build loader before installing it in lua-img.sh

Slightly more foolproof when all you're wanting to do is quickly get off the
ground with testing the lua loader.

tools/boot/lua-img.sh

@@ -20,6 +20,7 @@ mkdir -p ${dir}
 mtree -deUW -f etc/mtree/BSD.root.dist -p ${dir}
 mtree -deUW -f etc/mtree/BSD.usr.dist -p ${dir}/usr
 cd stand
+make MK_LOADER_LUA=yes MK_FORTH=no
 make install DESTDIR=${dir} NO_ROOT=t MK_LOADER_LUA=yes MK_FORTH=no MK_INSTALL_AS_USER=yes
 mkdir -p ${dir}/boot/kernel
 cp /boot/kernel/kernel ${dir}/boot/kernel