cf. comment in framework header. Should have no impact on real
run-time Java a11y, which would be enabled later as-needed; only
on JRE selection. For extreme corner-cases, where your auto-selected
JRE has no a11y support either select another JRE in the UI or:

$ export JFW_PLUGIN_FORCE_ACCESSIBILITY=1

to override.

Change-Id: I59a6428e5a11664b75c29580cad76eb9500db45a