Absorb qt5compat submodule

commit73b259312be1679420f5b4eefe4a3db9e37e3c09
parentd9778482042baf0de4dc1a91c39e9794e30f9c5e
parent3a6696825df4dc83ba91aea0c68c4f3b81d6e106
authormozsearch-qt index builder <mozsearch-qt@localhost>
committermozsearch-qt index builder <mozsearch-qt@localhost>
commit timeThu, 29 Oct 2026 16:26:01 +0000