[rasapi] fix test failure on platforms vista, w2k8

[Stefan Leichter]

failures fixed are:
http://test.winehq.org/data/520ab5c261706f6118a85a82ba84213932ba76e7/vista_Vista-Ult-SP1/rasapi32:rasapi.html
http://test.winehq.org/data/520ab5c261706f6118a85a82ba84213932ba76e7/2008_w2k8-ALH/rasapi32:rasapi.html

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