patch 8.1.0191: Perl test fails in 24 line terminal

Problem:    Perl test fails in 24 line terminal.
Solution:   Create fewer windows.

src/testdir/test_perl.vim

@@ -221,7 +221,7 @@ endfunc
 
 " Run first to get a clean namespace
 func Test_000_SvREFCNT()
-  for i in range(10)
+  for i in range(8)
     exec 'new X'.i
   endfor
   new t

src/version.c

@@ -789,6 +789,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    191,
 /**/
     190,
 /**/