[ANN] Set up OCaml 1.1.8

Ecosystem
1

Changed

  • The Windows opam wrapper is fractionally less-archaically named opam.cmd, with no loss in arcaneness.
  • Export CYGWIN_ROOT on the Windows runners, allowing bash to be invoked as %CYGWIN_ROOT%\bin\bash/$env:CYGWIN_ROOT\bin\bash (and similarly for Cygwin setup-x86_64.exe).
  • The Windows runner no longer prepends %CYGWIN_ROOT%\bin to PATH.

Fixed

  • Switches in Unix are now properly initialized before running depext.
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