Added Apoorv Upreti's GSoC2013 work: visual test suite.

See visualtest/README.txt for details.
libsdl-org · Nov 10, 2013 · 520697577839946852b562b37cd923bfdb6c2c10 · 5206975 · 5206975
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commit 520697577839946852b562b37cd923bfdb6c2c10
diff --git a/visualtest/stamp-h1 b/visualtest/stamp-h1
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+timestamp for config.h