Checks for signals in VM, allowing it to be interrupted by Ctrl-C (experimental)

 We simply reuse the ocaml flag caml_signals_are_pending and the function
 caml_process_pending_signals, and place a test at some place of the interpreter
 loop (at a similar location as in ocaml byterun/interp.c).

 The symbols caml_* we use are not officially made public in *.h installed
 alongside ocaml, but they seem pretty stable (there since at least
 ocaml 3.10, independent of arch and of byte/asm), so we access them via
 "extern". For once, thanks dirty C...

 In addition to that, when catching a Ctrl-C, we reset the vm via
 "coq_sp = coq_stack_high" as suggested by Benjamin G.

 This patch should be quite portable, it might even work in win32.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@13947 85f007b7-540e-0410-9357-904b9bb8a0f7

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