USER32: fix for failing tests of LB_GETTEXT on listbox on Win98

[Alex Villací­s Lasso]

Apparently Win98 does not support SendMessageW(LB_GETTEXT) on the 
listbox created by the test. It will return 0 on this case, and leave 
the output buffer untouched. This patch removes 32 test failures on Win98.

Changelog:
* Skip verifying buffer on failed LB_GETTEXT with SendMessageW() on Win98.

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

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