Add CONFLICTS entries that prevent simultaneous installation of normal
and devel versions of these ports. While these are allowed when the devel
versions are newer than the normal versions, this is not always the case
and especially not at this time. Instead of only conflicting with the
same version of each port, a version wildcard is used, to prevent
unexpected behavior if the non-devel version is updated to match the
devel version when both are installed.

Approved by: gerald (maintainer)