problem with running api v6 on windows

[sehz]

steps to reproduce:

• check out branch support_v14 on windows platform
• cd examples\function
• make test

this generates:

Finished dev [unoptimized + debuginfo] target(s) in 13.20s
node test.js
make: *** [Makefile:7: test] Error -1073741819

[Ryanmtate]

Appears to be breaking on https://github.com/infinyon/node-bindgen/blob/master/nj-core/src/basic.rs#L348 when attempting to convert the napi result in the napi_call_result! macro on https://github.com/infinyon/node-bindgen/blob/master/nj-core/src/lib.rs#L67

napi_get_cb_info signature looks good. Checking if there have been breaking changes.