Remove unused use statement.
Show defaulted version if phpversion() returns nothing, fixes #2313
Merge pull request #2308 from nicolas-bastien/remove_unused_use_statement

Remove unused use statement.
make sure relative paths from custom installers to not break the installation of binaries
Merge pull request #2317 from xrstf/installer-binaries

attempted fix for #1589 (installers & binaries)