Bug#986253: build with pie again

[Matthias Klose]

Package: src:pymol
Version: 2.4.0+dfsg-1
Tags: patch

pie builds were disabled in 2016.  pymol seems to build with pie again.
patch to re-enable:

http://launchpadlibrarian.net/531253709/pymol_2.4.0+dfsg-1_2.4.0+dfsg-1ubuntu1.diff.gz