vim-patch:7.4.1179 (#5112)

Problem:    test_writefile and test_viml do not delete the tempfile.
Solution:   Delete the tempfile. (Charles Cooper)  Add DeleteTheScript().

f4f79b84a5

test/functional/legacy/writefile_spec.lua

@@ -17,6 +17,7 @@ describe('writefile', function()
     execute('bwipeout!')
     execute('$put =readfile(f)')
     execute('1 delete _')
+    execute('call delete(f)')
 
     -- Assert buffer contents.
     expect([[