Revert "Bug #4517: Emit observer event to filter the Drag+Drop url list"

This reverts commit 768f2c0dbad0dbf1947211804a6446fee2f20a55.
Revert "Bug #3688: Build determinism fix: Disable library timestamping."

This reverts commit 066d0c2aadb48eaafed7191975a07ea60258734c.
Revert "Bug #10159: Build determinism fixes"

This reverts commit 63d2ba95d629baee7e6846842e89f9810f4b8335.
Revert "Bug #10139: Make --enable-strip work again"

This reverts commit ef637032fbc5b5c37b5a5e62610d3fecfcb760ec.