tests/lib-printf: allow for small variations in float formats

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13620 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
tests/makefiles/Makefile.toplevel: do not stop after a failed test

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13621 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
tests/utils/Makefile: port to mingw

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13622 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
testsuite: many small fixes to make it work for mingw

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13623 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02