Add new files for 7.4.549.

src/testdir/test_nested_function.in

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+Tests for Nested function                vim: set ft=vim :
+
+STARTTEST
+:so small.vim
+:fu! NestedFunc()
+:  fu! Func1()
+:    $put ='Func1'
+:  endfunction
+:  call Func1()
+:  fu! s:func2()
+:    $put ='s:func2'
+:  endfunction
+:  call s:func2()
+:  fu! s:_func3()
+:    $put ='s:_func3'
+:  endfunction
+:  call s:_func3()
+:  let fn = 'Func4'
+:  fu! {fn}()
+:    $put ='Func4'
+:  endfunction
+:  call {fn}()
+:  let fn = 'func5'
+:  fu! s:{fn}()
+:    $put ='s:func5'
+:  endfunction
+:  call s:{fn}()
+:endfunction
+:call NestedFunc()
+:/^result:/,$w! test.out
+:qa!
+ENDTEST
+
+result:

src/testdir/test_nested_function.ok

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+result:
+Func1
+s:func2
+s:_func3
+Func4
+s:func5