gdiplus: Add tests for GetMetafileHeader functions.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://newtestbot.winehq.org/JobDetails.pl?Key=4513

Your paranoid android.


=== wxppro (32 bit metafile) ===
metafile.c:338: Test failed: Expected 72.000000, got 81.279991
metafile.c:339: Test failed: Expected 72.000000, got 81.279991
metafile.c:372: Test failed: Expected 72.000000, got 81.279991
metafile.c:373: Test failed: Expected 72.000000, got 81.279991
metafile.c:399: Test failed: Expected 72.000000, got 81.279991
metafile.c:400: Test failed: Expected 72.000000, got 81.279991

=== wvista (32 bit metafile) ===
metafile.c:338: Test failed: Expected 72.000000, got 81.279991
metafile.c:339: Test failed: Expected 72.000000, got 81.279991
metafile.c:372: Test failed: Expected 72.000000, got 81.279991
metafile.c:373: Test failed: Expected 72.000000, got 81.279991
metafile.c:399: Test failed: Expected 72.000000, got 81.279991
metafile.c:400: Test failed: Expected 72.000000, got 81.279991

=== w2008s64 (32 bit metafile) ===
metafile.c:338: Test failed: Expected 72.000000, got 81.279991
metafile.c:339: Test failed: Expected 72.000000, got 81.279991
metafile.c:372: Test failed: Expected 72.000000, got 81.279991
metafile.c:373: Test failed: Expected 72.000000, got 81.279991
metafile.c:399: Test failed: Expected 72.000000, got 81.279991
metafile.c:400: Test failed: Expected 72.000000, got 81.279991

=== w7pro64 (32 bit metafile) ===
metafile.c:338: Test failed: Expected 72.000000, got 81.279991
metafile.c:339: Test failed: Expected 72.000000, got 81.279991
metafile.c:372: Test failed: Expected 72.000000, got 81.279991
metafile.c:373: Test failed: Expected 72.000000, got 81.279991
metafile.c:399: Test failed: Expected 72.000000, got 81.279991
metafile.c:400: Test failed: Expected 72.000000, got 81.279991

=== w2008s64 (64 bit metafile) ===
metafile.c:338: Test failed: Expected 72.000000, got 81.279999
metafile.c:339: Test failed: Expected 72.000000, got 81.279999
metafile.c:372: Test failed: Expected 72.000000, got 81.279999
metafile.c:373: Test failed: Expected 72.000000, got 81.279999
metafile.c:399: Test failed: Expected 72.000000, got 81.279999
metafile.c:400: Test failed: Expected 72.000000, got 81.279999

=== w7pro64 (64 bit metafile) ===
metafile.c:338: Test failed: Expected 72.000000, got 81.279991
metafile.c:339: Test failed: Expected 72.000000, got 81.279991
metafile.c:372: Test failed: Expected 72.000000, got 81.279991
metafile.c:373: Test failed: Expected 72.000000, got 81.279991
metafile.c:399: Test failed: Expected 72.000000, got 81.279991
metafile.c:400: Test failed: Expected 72.000000, got 81.279991