Reduce ramIndex file size
Reduce ramIndex file size

PR #2472: the bottom-most node of the r-tree contains
only a single index to a leaf node, so out of 532 bytes
only 4 are used.

neilbu/osrm-backend,KnockSoftware/osrm-backend,bjtaylor1/osrm-backend,hydrays/osrm-backend,deniskoronchik/osrm-backend,hydrays/osrm-backend,oxidase/osrm-backend,oxidase/osrm-backend,bjtaylor1/osrm-backend,bjtaylor1/osrm-backend,frodrigo/osrm-backend,raymond0/osrm-backend,duizendnegen/osrm-backend,beemogmbh/osrm-backend,KnockSoftware/osrm-backend,oxidase/osrm-backend,Project-OSRM/osrm-backend,yuryleb/osrm-backend,deniskoronchik/osrm-backend,beemogmbh/osrm-backend,neilbu/osrm-backend,felixguendling/osrm-backend,hydrays/osrm-backend,raymond0/osrm-backend,bjtaylor1/osrm-backend,KnockSoftware/osrm-backend,Project-OSRM/osrm-backend,beemogmbh/osrm-backend,hydrays/osrm-backend,frodrigo/osrm-backend,duizendnegen/osrm-backend,raymond0/osrm-backend,Project-OSRM/osrm-backend,frodrigo/osrm-backend,felixguendling/osrm-backend,raymond0/osrm-backend,yuryleb/osrm-backend,frodrigo/osrm-backend,oxidase/osrm-backend,duizendnegen/osrm-backend,duizendnegen/osrm-backend,yuryleb/osrm-backend,deniskoronchik/osrm-backend,yuryleb/osrm-backend,beemogmbh/osrm-backend,KnockSoftware/osrm-backend,deniskoronchik/osrm-backend,neilbu/osrm-backend,felixguendling/osrm-backend,Project-OSRM/osrm-backend,neilbu/osrm-backend