Restore setting CppFlags with a proper parameter.
Restore setting CppFlags with a proper parameter.

The initial value of CppFlags is now -I$(IncludeDir) which
should expand to -I/usr/local/include.

Signed-off-by: Rudá Moura <3ceaf19413469ca7df9f6a96603874755ef36481@gmail.com>

rudix-mac/rudix,rudix-mac/rudix,rudix-mac/rudix