Fix #2362 by using generic path strings
Fix #2362 by using generic path strings

In windows native strings in Lua incorrectly
interpreted because native separators must be escaped.
Use of generic strings prevent use of backslashes and
"Generic paths are portable and independent of the operating system.".

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