gdi32: add PS_ALTERNATE tests

[Felix Nawothnig]

Mostly done to see how it works... Passed on XP SP2. Should skip on 9x 
(according to the failures on test.winehq.com) but I haven't tested.
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  dlls/gdi32/tests/pen.c |   56 
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  1 files changed, 56 insertions(+), 0 deletions(-)
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