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/structs.h b/src/structs.h
index 774104c..6aaccc5 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2091,12 +2091,8 @@
 #define B_IMODE_USE_INSERT -1	/*	Use b_p_iminsert value for search */
 #define B_IMODE_NONE 0		/*	Input via none */
 #define B_IMODE_LMAP 1		/*	Input via langmap */
-#ifndef USE_IM_CONTROL
-# define B_IMODE_LAST 1
-#else
-# define B_IMODE_IM 2		/*	Input via input method */
-# define B_IMODE_LAST 2
-#endif
+#define B_IMODE_IM 2		/*	Input via input method */
+#define B_IMODE_LAST 2
 
 #ifdef FEAT_KEYMAP
     short	b_kmap_state;	/* using "lmap" mappings */