java/openjfx14: Fix openjfx14 after 9477c9da0a4

Removing USE_LDCONFIG from openjdk11 caused the package for openjfx14 to
fail to build, because it could not find libjvm.so, previously exported
from openjdk11 (and 8).

Making the openjfx14 package ignore this should be safe, as it in any
case relies on openjdk11 which again contains the lib and knows how to
locate and load it.

Thanks to ronald@ for pointing me in the right direction!

PR: 297282
Reported by: vvd@FreeBSD.org
Reviewed by: vvd@FreeBSD.org
Tested by: vvd@FreeBSD.org
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D59290