vim-patch:8.1.2056: "make test" for indent files doesn't cause make to fail

Problem:    "make test" for indent files doesn't cause make to fail.
Solution:   Exit the script with ":cquit". (Daniel Hahler, closes vim/vim#4949)
https://github.com/vim/vim/commit/cd67059c0c3abf1e28aa66458abdf6f338252eb2

.gitignore

@@ -42,6 +42,7 @@ tags
 /src/nvim/testdir/valgrind.*
 /src/nvim/testdir/.gdbinit
 /runtime/indent/testdir/*.out
++runtime/indent/testdir/*.fail
 # Generated by src/nvim/testdir/runnvim.sh.
 /src/nvim/testdir/*.tlog
 

runtime/indent/testdir/runtest.vim

@@ -20,6 +20,7 @@ func HandleSwapExists()
   endif
 endfunc
 
+let failed_count = 0
 for fname in glob('testdir/*.in', 1, 1)
   let root = substitute(fname, '\.in', '', '')
 
@@ -110,6 +111,7 @@ for fname in glob('testdir/*.in', 1, 1)
     endif
 
     if failed
+      let failed_count += 1
       exe 'write ' . root . '.fail'
       echoerr 'Test ' . fname . ' FAILED!'
     else
@@ -123,4 +125,8 @@ endfor
 " Matching "if 1" at the start.
 endif
 
+if failed_count > 0
+  " have make report an error
+  cquit
+endif
 qall!