Implement undocumented ToolBar feature

[Guy L. Albertelli]

Found this "feature" while playing with OE 5.

Changelog:
Guy Albertelli  <<galberte at neo.lrun.com>>

  dlls/comctl32/toolbar.c
   - Undocumented feature of TB_{GET|SET}BUTTONINFO{A|W}: if mask 
     has 0x80000000 set then the command id is really the index.

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