gdi32: Remove call to CreateCompatibleDC() from GetDIBits() implementation (try 1)

[Alex Villací­s Lasso]

This is the first attempt at a patch that will fix the debug assertion 
when icons are rendered into metafiles (triggered by Enterprise 
Architect 6.5, and possibly others). This patch simply removes mentions 
of memdc, created by a call to CreateCompatibleDC(), and redirects calls 
to GetDIBColorTable() to use the original DC instead of memdc. Intends 
to fix bug #6439. Now with patch.

Patch also posted in bug report #6439.

Changelog:
* Remove call to CreateCompatibleDC() from GetDIBits() implementation, 
to allow calling GetDIBits() with GDI lock held.

-- 
The following cryptic message was allegedly found in the inner edge of a Windows
XP installation CD:

4F6E65204F5320746F2072756C65207468656D20616C6C2C204F6E65204F5320746F2066696E6420
7468656D2C0D0A4F6E65204F5320746F206272696E67207468656D20616C6C20616E6420696E2074
6865206461726B6E6573732062696E64207468656D2E0A

It is rumored that only a true Unix Wizard can decypher this mysterious message,
which supposedly encodes the true nature and purpose of the software.

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