patch 8.1.0811: too many #ifdefs

Problem:    Too many #ifdefs.
Solution:   Graduate FEAT_MBYTE, the final chapter.
diff --git a/src/testdir/test_profile.vim b/src/testdir/test_profile.vim
index 1d49523..d6e9c03 100644
--- a/src/testdir/test_profile.vim
+++ b/src/testdir/test_profile.vim
@@ -407,7 +407,7 @@
 endfunc
 
 func Test_profile_truncate_mbyte()
-  if !has('multi_byte') || &enc !=# 'utf-8'
+  if &enc !=# 'utf-8'
     return
   endif