Description of problem:
Token generation succeeds but prints error "Failed to use libqrencode to show QR code visually for scanning" if qrencode-libs package is not installed.

Version-Release number of selected component (if applicable):
All

How reproducible:
Always

Steps to Reproduce:
1. Run /usr/bin/google-authenticator

Actual results:
"Failed to use libqrencode to show QR code visually for scanning"

Expected results:
QR code printed.

Additional info:
Lack of build linkage means qrencode-libs is not autodepped, and must be specified as part of spec file (Requires: or Recommends:)