sysutils/syslog-ng{310, 311, 312, 313, 314, 315, 317, 37, 39}: Fix JAVA option
Use JAVA_USE syntax to make the port correctly depend on
JAVA runtime and buildtime when the corresponding option is selected

Reported by: Filias Heidt <fh@netzkommune.de>
Reviewed by: cy (maintainer), mat
Approved by: cy (maintainer)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D17291