#4719: fix (when a bytecode calls ocamlrun, the name of the bytecode is in argv[0]). It would be more robust to have headernt.c extract the full path to the bytecode and pass it explicitly to ocamlrun.exe (as its first argument).

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13801 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02