sci-libs/gmsh: Updated sci-libs/gmsh to 2.8.5 and EAPI to 5

Package-Manager: portage-2.3.6-r9
Merge PR #260 from Carl Dong: update sci-libs/gmsh to 2.8.5 and change EAPI to 5
sci-mathematics/petsc: fix INCLUDE dirs in petscvariables
sci-libs/gmsh: fix sci-mathematics/petsc dependency
sci-libs/gmsh: remove old and live versions

old version is outdated and has problems with compilation
svn repo can not be accessed anonymously