gpgImportExternalKey does not work in Windows 7 x86_64

[dbarabash]

Hello,

I built webpg-npapi in Win 7 64. "gpgImportExternalKey" works well in Win 7 32 but returns error in Win 7 64.

[kylehuff]

I believe I have already solved this issue with an upcoming commit, I will test it and verify this weekend before I push out my changes.