coqdep: honor dependencies of "Load"ed files
coqdep: honor dependencies of "Load"ed files

Imagine A.v "Load"s B.v and that B.v "Require"s C.
Before this commit we get:

  A.vo: A.v B.v

After this commit we get:

  A.vo: A.v B.v C.vo

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@15939 85f007b7-540e-0410-9357-904b9bb8a0f7

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