fix(solver-problems): preserve first-occurrence order in extension hint

create_extension_hint's --ignore-platform-req suggestion list sorted
missing extensions alphabetically before deduping. PHP's array_unique
removes duplicates while preserving first-occurrence order instead,
which for this call site matches the order problems were reported in
(root-require-not-found problems before SAT-conflict problems).
Replaced the sort+dedup with the existing order-preserving
shirabe_php_shim::array_unique, which was already ported for exactly
this PHP semantic but wasn't used here.

0 files changed, 0 insertions, 0 deletions