Fix public issue #10: Don't add GTEST_CPPFLAGS to snappy_unittest_CXXFLAGS;
it's not needed (CPPFLAGS are always included when compiling).

R=csilvers
DELTA=1  (0 added, 1 deleted, 0 changed)


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git-svn-id: https://snappy.googlecode.com/svn/trunk@12 03e5f5b5-db94-4691-08a0-1a8bf15f6143