Checking up header files ( take 1 : winuser.h )

[remi.assailly at free.fr]

Changelog:
* add missing tags in include/winuser.h

I will send a patch with missing structures ( I know that we do not just have to
declare it ! ).
If you want to do this, missing structures I found are:
*PEVENTMSGMSG,*LPEVENTMSGMSG; ( declared with : EVENTMSG,*PEVENTMSG,
*LPEVENTMSG; )
DROPSTRUCT,*PDROPSTRUCT,*LPDROPSTRUCT;
ALTTABINFO, *PALTTABINFO, *LPALTTABINFO;
MENUBARINFO, *PMENUBARINFO, *LPMENUBARINFO;
SCROLLBARINFO, *PSCROLLBARINFO, *LPSCROLLBARINFO;
LASTINPUTINFO, *PLASTINPUTINFO;
KBDLLHOOKSTRUCT, FAR *LPKBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;

Tell me ;)