Certain distributions (e.g. Debian and Ubuntu) have enabled PIE be
default in their GCC packaging. This breaks our abuse of GCC as a linker
which requires that we pass -Wl,-r, which is incompatible with
PIE (since the former implies that we are generating a relocatable
object file and the latter an executable).

Test Plan: Validate

Reviewers: hvr, austin

Subscribers: rwbarton, thomie, erikd

Differential Revision: https://phabricator.haskell.org/D2691

GHC Trac Issues: #12759