patch 8.1.2358: tests fail on Cirrus CI for FreeBSD

Problem:    Tests fail on Cirrus CI for FreeBSD.
Solution:   Fix a test and skip some. (Christian Brabandt, closes #5281)
diff --git a/src/testdir/test_utf8_comparisons.vim b/src/testdir/test_utf8_comparisons.vim
index 312925b..f3c86b4 100644
--- a/src/testdir/test_utf8_comparisons.vim
+++ b/src/testdir/test_utf8_comparisons.vim
@@ -86,6 +86,9 @@
 " test that g~ap changes one paragraph only.
 func Test_gap()
   new
-  call feedkeys("iabcd\n\ndefggg0g~ap", "tx")
+  " setup text
+  call feedkeys("iabcd\<cr>\<cr>defg", "tx")
+  " modify only first line
+  call feedkeys("gg0g~ap", "tx")
   call assert_equal(["ABCD", "", "defg"], getline(1,3))
 endfunc