uxtheme: speed up UXTHEME_SizedBlt(ST_TILE)

[Alex Villací­s Lasso]

I was very annoyed with the slowness of the theme engine in the listbox 
case (as used by builtin regedit). I tracked down the source of the 
slowdown to a iteration in UXTHEME_SizedBlt() that repeatedly calls 
UXTHEME_Blt() in order to cover the required area. The attached patch 
replaces this with an iteration over a memory bitmap that is then used 
by UXTHEME_Blt() in a single call. All tests still pass. Results in 
noticeable speedup in the painting of the listview header in regedit and 
the two uses in winecfg.

Changelog:
* Speed up UXTHEME_SizedBlt in the ST_TILE by building an 
appropriately-sized memory bitmap out of the tile instead of iterating 
with UXTHEME_Blt() directly.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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