vim-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 vim/vim#5281)
9134f1ecd4

Skip test_normal.vim: already applied in #11483.

src/nvim/testdir/check.vim

@@ -63,6 +63,15 @@ func CheckUnix()
   endif
 endfunc
 
+" Command to check for not running on a BSD system.
+" TODO: using this checks should not be needed
+command CheckNotBSD call CheckNotBSD()
+func CheckNotBSD()
+  if has('bsd')
+    throw 'Skipped: does not work on BSD'
+  endif
+endfunc
+
 " Command to check that making screendumps is supported.
 " Caller must source screendump.vim
 command CheckScreendump call CheckScreendump()

src/nvim/testdir/test_quickfix.vim

@@ -1789,6 +1789,7 @@ func s:create_test_file(filename)
 endfunc
 
 func Test_switchbuf()
+  CheckNotBSD
   call s:create_test_file('Xqftestfile1')
   call s:create_test_file('Xqftestfile2')
   call s:create_test_file('Xqftestfile3')

src/nvim/testdir/test_source_utf8.vim

@@ -1,7 +1,10 @@
 " Test the :source! command
+source check.vim
 
 func Test_source_utf8()
   " check that sourcing a script with 0x80 as second byte works
+  " does not work correctly on BSD
+  CheckNotBSD
   new
   call setline(1, [':%s/àx/--à1234--/g', ':%s/Àx/--À1234--/g'])
   write! Xscript
@@ -31,6 +34,7 @@ endfunc
 
 " Test for sourcing a file with CTRL-V's at the end of the line
 func Test_source_ctrl_v()
+    CheckNotBSD
     call writefile(['map __1 afirst',
 		\ 'map __2 asecond',
 		\ 'map __3 athird',

src/nvim/testdir/test_utf8_comparisons.vim

@@ -86,6 +86,9 @@ endfunc
 " 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