add $COQTOP to the search path of ocamldebug
add $COQTOP to the search path of ocamldebug

in a debug session with ocamldebug 3.10, it was looking for file 
like contrib/foo/bar.ml and not just bar.ml in directories like 
contrib/foo, hence failing to find such a file. A quick fix is to 
add $COQTOP itself to the search path. 



git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@10193 85f007b7-540e-0410-9357-904b9bb8a0f7

pirapira/coq2rust,tomprince/coq,Ptival/coq,maximedenes/coq,Zimmi48/coq,aspiwack/coq,gares/coq,coq/coq,pirbo/coq,ejgallego/coq,amintimany/coq,silene/coq,maximedenes/coq,mattam82/Coq-misc,jhjourdan/coq,Zimmi48/coq,pirapira/coq2rust,coq/coq,mlasson/coq,aspiwack/coq,TheTypoMaster/coq,letouzey/coq-wip,letouzey/coq-wip,jpdeplaix/coq,tomprince/coq,herbelin/coq-hh,ale-f/coq,ale-f/coq,letouzey/coq-wip,ejgallego/coq,Matafou/coq,aspiwack/coq,shindere/coq,letouzey/coq-wip,coq/coq,mattam82/coq,TOSPIO/coq,silene/coq,Zimmi48/coq,herbelin/github-coq,coq/coq,tomprince/coq,mattam82/coq,ppedrot/coq,gares/coq,shindere/coq,mattam82/coq,shindere/coq,JasonGross/coq,TOSPIO/coq,barras/coq,SkySkimmer/coq,Ptival/coq,william-lawvere/coq,Lionel-Rieg/coq,Lionel-Rieg/coq,ale-f/coq,gmalecha/coq,8l/coq,8l/coq,herbelin/github-coq,ppedrot/coq,william-lawvere/coq,TheTypoMaster/coq,gmalecha/coq,JasonGross/coq,Matafou/coq,ejgallego/coq,ppedrot/coq,TheTypoMaster/coq,jpdeplaix/coq,gmalecha/coq,jhjourdan/coq,pirbo/coq,maximedenes/coq,mattam82/Coq-misc,maximedenes/coq,SkySkimmer/coq,Ptival/coq,SkySkimmer/coq,TOSPIO/coq,Lionel-Rieg/coq,mlasson/coq,letouzey/coq-wip,herbelin/coq-hh,william-lawvere/coq,gares/coq,mlasson/coq,barras/coq,JasonGross/coq,asr/coq,8l/coq,ppedrot/coq,silene/coq,gares/coq,jpdeplaix/coq,ppedrot/coq,amintimany/coq,pirapira/coq2rust,maximedenes/coq,Zimmi48/coq,asr/coq,asr/coq,gares/coq,herbelin/github-coq,Matafou/coq,amintimany/coq,SkySkimmer/coq,jhjourdan/coq,pirbo/coq,JasonGross/coq,barras/coq,ejgallego/coq