patch 8.2.0320: no Haiku support

Problem:    No Haiku support.
Solution:   Add support for Haiku. (Emir Sari, closes #5605)
diff --git a/src/version.c b/src/version.c
index e3ff8e1..46540e9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    320,
+/**/
     319,
 /**/
     318,
@@ -1722,6 +1724,9 @@
     msg_puts(_("with X11-Athena GUI."));
 #    endif
 #   else
+#    ifdef FEAT_GUI_HAIKU
+    msg_puts(_("with Haiku GUI."));
+#    else
 #     ifdef FEAT_GUI_PHOTON
     msg_puts(_("with Photon GUI."));
 #     else
@@ -1736,6 +1741,7 @@
 #	 else
 #	 endif
 #	endif
+#	 endif
 #      endif
 #    endif
 #   endif