Revert "Hack to pass -coverage to linker"
Revert "Hack to pass -coverage to linker"

This reverts commit b4ffde3dc7bc30b93050e66c7288e79e3058433e.

It did not fix #432.

astropy/astropy-helpers,Cadair/astropy-helpers,Cadair/astropy-helpers,astropy/astropy-helpers