package/tmux: add utf8proc optional dependency

utf8proc is an optional dependency since version 2.3 and
https://github.com/tmux/tmux/commit/6c94774b70f72952c4c512e4aa59a207ca1c34f2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 1f618aa388535181c281c85e2b5264532de4ef0f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/tmux/tmux.mk

@@ -11,6 +11,13 @@ TMUX_LICENSE_FILES = COPYING
 TMUX_CPE_ID_VENDOR = tmux_project
 TMUX_DEPENDENCIES = libevent ncurses host-pkgconf
 
+ifeq ($(BR2_PACKAGE_UTF8PROC),y)
+TMUX_DEPENDENCIES += utf8proc
+TMUX_CONF_OPTS += --enable-utf8proc
+else
+TMUX_CONF_OPTS += --disable-utf8proc
+endif
+
 # Add /usr/bin/tmux to /etc/shells otherwise some login tools like dropbear
 # can reject the user connection. See man shells.
 define TMUX_ADD_TMUX_TO_SHELLS