Script intended to make the compilation instructions for the Microsoft
Visual C++ Compiler ports a little simpler.
This script allows the user to start Cygwin from the appropriate Visual
Studio Command Prompt (e.g. by issuing `C:\cygwin\bin\mintty -`) and then,
from the OCaml sources directory, issue
```bash
eval `tools/msvs-promote-path`
```
This script emits an error if the Microsoft Linker cannot be found in any
of the directories in `PATH` or if the `link` command already refers to the
Microsoft Linker. If, as will usually be the default, `link` refers to the
coreutils `link` command, `PATH` is altered to move the first entry
containing the Microsoft Linker to the start of `PATH`. This has the
effect of overriding the Unix interpretation of the `link` command, but
this will never affect OCaml's build process.
This script is taken from msvs-tools
(https://github.com/metastack/msvs-tools) and re-licensed by the copyright
holder.
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