www/qt5-webengine: Restore patches required for armv7
- Copy two patches back that are relevant for armv7 from r515730 (= revision prior the update to 5.13.0).
Both files were introduced in r497877 and should have been left untouched by the update.
- Not bumping PORTREVISION because only armv7 related code has changed and it's not yet known if the port can be built successfully on that platform since www/qt5-webengine was updated to 5.13.0.
Approved by: tcberner (kde)
Differential Revision: https://reviews.freebsd.org/D22166