Add tests for ImageGetDigestStream

[testbot at testbot.winehq.org]

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
http://testbot.winehq.org/JobDetails.pl?Key=1950

Your paranoid android.


=== W7PROX64 (64 bit image) ===
image.c:324: Test failed: ImageGetDigestStream failed: 87
image.c:187: Test failed: flags = 0: expected 7 updates, got 3
image.c:194: Test failed: flags = 0, update 2: unexpected value
image.c:187: Test failed: flags = CERT_PE_IMAGE_DIGEST_ALL_IMPORT_INFO: expected 5 updates, got 3
image.c:194: Test failed: flags = CERT_PE_IMAGE_DIGEST_ALL_IMPORT_INFO, update 2: unexpected value