patch 8.0.1336: cannot use imactivatefunc() unless compiled with +xim

Problem:    Cannot use imactivatefunc() unless compiled with +xim.
Solution:   Allow using imactivatefunc() when not compiled with +xim.
            (Yasuhiro Matsumoto, closes #2349)
diff --git a/src/option.h b/src/option.h
index d963c1f..57126a3 100644
--- a/src/option.h
+++ b/src/option.h
@@ -581,11 +581,13 @@
 EXTERN int	p_ic;		/* 'ignorecase' */
 #if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
 EXTERN char_u	*p_imak;	/* 'imactivatekey' */
+#define IM_ON_THE_SPOT		0L
+#define IM_OVER_THE_SPOT	1L
+EXTERN long	p_imst;		/* 'imstyle' */
+#endif
+#if defined(FEAT_EVAL) && defined(USE_IM_CONTROL)
 EXTERN char_u	*p_imaf;	/* 'imactivatefunc' */
 EXTERN char_u	*p_imsf;	/* 'imstatusfunc' */
-EXTERN long	p_imst;		/* 'imstyle' */
-# define IM_ON_THE_SPOT		0L
-# define IM_OVER_THE_SPOT	1L
 #endif
 #ifdef USE_IM_CONTROL
 EXTERN int	p_imcmdline;	/* 'imcmdline' */