update comments on all ifdefs

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

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
quagga: explicitly ignore return value of fcntl

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Fix memory leak when adding and deleting routes