[Omake] implicit rules with different scopes

[Matthieu Dubuget]

Hello,

I can't figure out a simple way to have both: special scope for some
files, but still using implicit rules?

For example, I would like to let OMake apply implicit rules with a
special environment (for example special OCAMLFLAGS) when working with
file1.ml and apply the same implicit rules with another environment when
working with file2.ml.

Both files are in the same directory.

Thanks

Matt