GDI32: GetSystemPaletteEntries should fill with default palette in non-palette video mode (with tests)

[Alex Villací­s Lasso]

Patches originally by Alexander Dorofeyev <alexd14 at hushmail.com>.

This patch tries to fix bug #201 (igowin shows black squares instead of 
proper transparency). It was sent back in October, but there was no 
feedback back then. So I am resending a rediff against current git.

Changelog:
* GetSystemPaletteEntries() should fill entries with default 20-color 
system palette when called in a non-palette video mode.
* Tests for above behavior.

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

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