[Configure] fix configuration problem with coqtop
When coqtop -config return something like ``` CAMLP4OPTIONS=-loc loc ``` (cf https://coq.inria.fr/bugs/show_bug.cgi?id=4163)
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When coqtop -config return something like ``` CAMLP4OPTIONS=-loc loc ``` (cf https://coq.inria.fr/bugs/show_bug.cgi?id=4163)