patch 8.1.0811: too many #ifdefs

Problem:    Too many #ifdefs.
Solution:   Graduate FEAT_MBYTE, the final chapter.
diff --git a/src/structs.h b/src/structs.h
index 3216c58..e25ae17 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -416,12 +416,8 @@
 /*
  * structures used in undo.c
  */
-#if VIM_SIZEOF_INT > 2
-# define ALIGN_LONG	/* longword alignment and use filler byte */
-# define ALIGN_SIZE (sizeof(long))
-#else
-# define ALIGN_SIZE (sizeof(short))
-#endif
+#define ALIGN_LONG	/* longword alignment and use filler byte */
+#define ALIGN_SIZE (sizeof(long))
 
 #define ALIGN_MASK (ALIGN_SIZE - 1)
 
@@ -1229,19 +1225,11 @@
 # endif
 #else
 /* Use 32-bit Number. */
-# if VIM_SIZEOF_INT <= 3	/* use long if int is smaller than 32 bits */
-typedef long		    varnumber_T;
-typedef unsigned long	    uvarnumber_T;
-#define VARNUM_MIN	    LONG_MIN
-#define VARNUM_MAX	    LONG_MAX
-#define UVARNUM_MAX	    ULONG_MAX
-# else
 typedef int		    varnumber_T;
 typedef unsigned int	    uvarnumber_T;
 #define VARNUM_MIN	    INT_MIN
 #define VARNUM_MAX	    INT_MAX
 #define UVARNUM_MAX	    UINT_MAX
-# endif
 #endif
 
 typedef double	float_T;