[gdi32/tests] Skip functions that are available but not implemented

[Paul Vriens]

Hi,

Several functions are exported but not implemented so check for that. This fixes
some test failure on win98 and NT. The SetLastError at the start of 
test_SetICMMode was needed to not use the old value of last error in the error 
output.

Win95 still crashes on this icm test as it can't cope with GetDC( NULL ).
NT still fails on the SetICMMode calls. According to MSDN this function is not 
implemented on NT but the OS doesn't state this.

Changelog
   Skip functions that are available but not implemented

-- 
Cheers,

Paul.

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