patch 8.0.0162: build error on Fedora 23

Problem:    Build error on Fedora 23 with small features and gnome2.
Solution:   Undefine ngettext(). (Hirohito Higashi)

Author: brammool

src/gui_gtk.c

@@ -51,6 +51,9 @@
 # ifdef _
 #  undef _
 # endif
+# ifdef ngettext
+#  undef ngettext
+# endif
 # ifdef N_
 #  undef N_
 # endif

src/gui_gtk_x11.c

@@ -35,6 +35,9 @@
 # ifdef _
 #  undef _
 # endif
+# ifdef ngettext
+#  undef ngettext
+# endif
 # ifdef N_
 #  undef N_
 # endif

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    162,
 /**/
     161,
 /**/