Bug#848129: pie-link specs should not be passed when pie is not enabled

[Matthias Klose]

Package: dpkg-dev
Version: 1.18.15
Severity: important
Tags: sid stretch

This is seen on all architectures where pie is not enabled by default. These
specs should not be passed when pie is not in effect.  Seen only when looking at
the python2.7 ftbfs on x32.  And verified that the python2.7 build succeeds
again when the specs are not passed.