Makefile.build : update the otags rule
Makefile.build : update the otags rule

 There were a forgotten CAMLP4DEPS macro.
 We also avoid otags failure with camlp5 (in this case, it only
 builds the tags of regular .ml files, not .ml4).

Lionel-Rieg/coq,JasonGross/coq,SkySkimmer/coq,letouzey/coq-wip,coq/coq,maximedenes/coq,william-lawvere/coq,Zimmi48/coq,william-lawvere/coq,gares/coq,maximedenes/coq,mattam82/coq,gares/coq,JasonGross/coq,letouzey/coq-wip,Zimmi48/coq,silene/coq,letouzey/coq-wip,JasonGross/coq,ppedrot/coq,ejgallego/coq,Ptival/coq,coq/coq,SkySkimmer/coq,ppedrot/coq,Zimmi48/coq,mattam82/coq,SkySkimmer/coq,william-lawvere/coq,Lionel-Rieg/coq,SkySkimmer/coq,coq/coq,ppedrot/coq,Ptival/coq,gares/coq,silene/coq,Ptival/coq,JasonGross/coq,amintimany/coq,coq/coq,mattam82/coq,ppedrot/coq,ejgallego/coq,ejgallego/coq,Matafou/coq,gares/coq,letouzey/coq-wip,maximedenes/coq,amintimany/coq,Matafou/coq,ppedrot/coq,amintimany/coq,Lionel-Rieg/coq,maximedenes/coq,letouzey/coq-wip,gares/coq,ejgallego/coq,silene/coq,maximedenes/coq,Matafou/coq,Zimmi48/coq