patch 8.2.0705: indent tests don't run on CI for FreeBSD

Problem:    Indent tests don't run on CI for FreeBSD.
Solution:   Set modeline. (Ozaki Kiichi, closes #6048)

.cirrus.yml

@@ -13,5 +13,4 @@ freebsd_12_task:
     - make -j${NPROC}
     - src/vim --version
   test_script:
-    # Runtime Indent tests do not work, run only the normal test suite
-    - cd src && make test
+    - make test

runtime/indent/testdir/runtest.vim

@@ -10,6 +10,7 @@ filetype indent on
 syn on
 set nowrapscan
 set report=9999
+set modeline
 
 au! SwapExists * call HandleSwapExists()
 func HandleSwapExists()

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    705,
 /**/
     704,
 /**/