ports: build vim/vim-minial with --enable-multibyte

A first step to complete UTF-8 support in the terminal (e.g.,
system_shell).

repos/ports/src/noux-pkg/vim/target.inc

@@ -1,7 +1,7 @@
 CONFIGURE_ARGS = --disable-selinux --disable-xsmp --disable-xsmp-interact \
                  --disable-netbeans --disable-gtktest --disable-largefile \
                  --disable-acl --disable-gpm --disable-sysmouse \
-                 --disable-nls
+                 --disable-nls --enable-multibyte
 
 #
 # configure: error: cross-compiling: please set 'vim_cv_toupper_broken'