patch 9.0.0106: illegal byte regexp test doesn't fail when fix is reversed

Problem:    Illegal byte regexp test doesn't fail when fix is reversed.
Solution:   Make sure illegal bytes end up in sourced script file.
diff --git a/src/testdir/test_regexp_utf8.vim b/src/testdir/test_regexp_utf8.vim
index e7672dd..d665a6f 100644
--- a/src/testdir/test_regexp_utf8.vim
+++ b/src/testdir/test_regexp_utf8.vim
@@ -563,12 +563,8 @@
 endfunc
 
 func Test_match_illegal_byte()
-  let lines =<< trim END
-      silent! buffer ÿ\c
-      next ÿ
-      0scriptnames
-      source
-  END
+  " Text has illegal bytes which need to be set explicitly
+  let lines = ["norm :set no\x01\<CR>", "silent n\xff", "silent norm :b\xff\<CR>"]
   call writefile(lines, 'Xregexp')
   call system(GetVimCommand() .. ' -X -Z -e -s -S Xregexp -c qa!')
 
diff --git a/src/version.c b/src/version.c
index 6593e59..44ee33f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    106,
+/**/
     105,
 /**/
     104,