api: compile against the same ee.j2se as the other projects

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Sync up the eclipse source settings to the actual ee.j2se

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
remove JREs from Eclipse build paths

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>