Asks camlp5 binary in path its location

before looking in CAMLLIB/camlp5 folder

Patch by Thomas Braibant

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@17045 85f007b7-540e-0410-9357-904b9bb8a0f7
test-suite fixup

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@17046 85f007b7-540e-0410-9357-904b9bb8a0f7
empty token in terminal is a user error not an anomaly (bug 3118)

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@17047 85f007b7-540e-0410-9357-904b9bb8a0f7