gdi32/tests: Add antialiasing font tests [try #2]

[Glenn Wurster]

Changelog:
  gdi32/tests: Add font antialiasing tests

Add tests to ensure that antialiasing is not used even if requested
when we are operating in a palette drawing mode, and that antialiasing
is used when operating in a non-palette mode.

Changes since attempt 1:
  * Clear the bitmap before we write the text to it.
  * Document in this e-mail tests performed.

Tested on XP (sp2), 98, and Wine, also run through Valgrind (did this on
the initial patch as well but forgot to mention that in the e-mail).

Glenn Wurster.

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 dlls/gdi32/tests/font.c |  163 +++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 163 insertions(+), 0 deletions(-)
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