patch 8.1.1873: cannot build tiny version

Problem:    Cannot build tiny version.
Solution:   Remove #ifdef for is_autocmd_blocked().

src/autocmd.c

@@ -2241,14 +2241,11 @@ unblock_autocmds(void)
 # endif
 }
 
-#if defined(FEAT_EVAL) && (defined(FEAT_XIM) || defined(IME_WITHOUT_XIM)) \
-	|| defined(PROTO)
     int
 is_autocmd_blocked(void)
 {
     return autocmd_blocked != 0;
 }
-#endif
 
 /*
  * Find next autocommand pattern that matches.

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1873,
 /**/
     1872,
 /**/