fix building with --disable-speller

http://bugs.gentoo.org/221219
https://savannah.gnu.org/bugs/index.php?23227

--- src/global.c
+++ src/global.c
@@ -1033,9 +1033,11 @@ void shortcut_init(bool unjustify)
     add_to_sclist(MMAIN, "^C", do_cursorpos_void, 0, TRUE);
     add_to_sclist(MMAIN, "F11", do_cursorpos_void, 0, TRUE);
 #ifndef NANO_TINY
+#ifndef DISABLE_SPELLER
     add_to_sclist(MMAIN, "^T", do_spell, 0, TRUE);
     add_to_sclist(MMAIN, "F12", do_spell, 0, TRUE);
 #endif
+#endif
     add_to_sclist(MMAIN, "^_", do_gotolinecolumn_void, 0, TRUE);
     add_to_sclist(MMAIN, "F13", do_gotolinecolumn_void, 0, TRUE);
     add_to_sclist(MMAIN, "M-G", do_gotolinecolumn_void, 0, TRUE);