syncthing: GOFLAGS set to mod=vendor

[Vouivre]

Build changed according to #976

Installed manifest of package

(kiss manifest <pkg>)

/var/db/kiss/installed/syncthing/version
/var/db/kiss/installed/syncthing/sources
/var/db/kiss/installed/syncthing/manifest
/var/db/kiss/installed/syncthing/depends
/var/db/kiss/installed/syncthing/checksums
/var/db/kiss/installed/syncthing/build
/var/db/kiss/installed/syncthing/
/var/db/kiss/installed/
/var/db/kiss/
/var/db/
/var/
/usr/bin/syncthing
/usr/bin/
/usr/

Existing package

• I am the maintainer of this package.