"keybase pgp select" and "keybase pgp import" fail on Windows

I have keys configured in my local GPG instance (master, and subkeys); I am trying to import them into keybase. When I do this, the secrets are still in the local GPG (i.e. not just stubs).

I'm trying `keybase pgp select`, it presents me an option of selecting the key to import, and when I do, I get the following error:
```
Choose a key: 1
- INFO Bundle unlocked: XXXXXXXXXXXXXXXX
- ERROR key generation error: No secret key available
```
The same thing happens when I try `keybase pgp select --no-import`

Furthermore, when I actually try to import from a file, I get the following behavior:
```
keybase pgp import -i secret_master_with_subkeys.txt
- ERROR No secret key available
```

my log id: 59cb42a03b5bcdc22e8cd81c

Start by reproducing the Windows failures with `keybase pgp select`, `keybase pgp select --no-import`, and `keybase pgp import -i secret_master_with_subkeys.txt`. Use log ID 59cb42a03b5bcdc22e8cd81c to investigate why the configured secret key is unavailable; done means selecting and importing the master key with subkeys succeeds.

Written by the indexing model from the issue text.