makefile.unix: Removed redundant use of wx-config in DEFS (it was being included twice).     Also changed wx-config --cppflags to --cxxflags. I am not sure what the     difference is supposed to be, but --cppflags does not include -pthread.
makefile.unix: Removed redundant use of wx-config in DEFS (it was being included twice).
    Also changed wx-config --cppflags to --cxxflags. I am not sure what the
    difference is supposed to be, but --cppflags does not include -pthread.

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