patch 8.1.0780: terminal test fails on Mac

Problem:    Terminal test fails on Mac.
Solution:   Skip the test on Mac.

src/testdir/test_terminal.vim

@@ -643,8 +643,9 @@ func Test_terminal_write_stdin()
 endfunc
 
 func Test_terminal_no_cmd()
+  " Does not work on Mac.
   " Todo: make this work on Win32 again
-  if has('win32')
+  if has('mac') || has('win32')
     return
   endif
   let buf = term_start('NONE', {})

src/version.c

@@ -791,6 +791,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    780,
 /**/
     779,
 /**/