Log Message:
gdome2 uses libtool, so use USE_LIBTOOL=YES.

Bump PKGREVISION as the share library versioning changes.

Bump BUILDLINK_DEPENDS.gdome2 required.

And bump PKGREVISION for its only dependency: ntop.

This fixes build issue for ntop. (Before this fix,
gdome2's libgdome.la file listed .la files for libiconv
and libz, but on some systems using native versions they
didn't exist.)

This will close PR #29525.