coq_makefile doesn't complain anymore when a dir is both -I and -R
coq_makefile doesn't complain anymore when a dir is both -I and -R

It used to deal correctly with that so why a warning ?

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@14269 85f007b7-540e-0410-9357-904b9bb8a0f7

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