davide authored Nov 29, 2018 and Alp Mestanogullari committed Nov 29, 2018

* (#15837 point 5) Use the -rpath gcc option and using the $ORIGIN
variable which the dynamic linker sets to the location of the ghc
binary.
* (#15837 point 4) "-fPIC -dynamic" options are used when building ghc
when either ghc or the rts have a dynamic way.
* (#15837 point 7) "-shared -dynload deploy" options are only used when
linking a library (no longer when linking a program).

Reviewers: bgamari, alpmestan

Reviewed By: alpmestan

Subscribers: adamse, rwbarton, carter

Differential Revision: https://phabricator.haskell.org/D5281