Make CYGWIN environment variable configurable

Some users might want different behaviour from the CYGWIN environment
variable, and in particular it seems reasonable to assume they don't
want non-default behaviour unless they explicitly ask for it.  As such,
make the environment variable configurable, and default to empty.

This change is not backwards compatible: prior to this change a Cygwin
install will have CYGWIN=winsymlinks:nativestrict, whereas afterwards
the variable will default to blank.  To obtain the previous behaviour, a
user would need to add `env: 'winsymlinks:nativestrict'` to the set of
inputs.

Fixes #1.

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