Use an environment variable instead of command substitution (#5364)
Use an environment variable instead of command substitution (#5364)

`$PWD` is already there so use it instead of running `pwd(1)` in a subshell each time.
Project-OSRM/osrm-backend,frodrigo/osrm-backend,felixguendling/osrm-backend,bjtaylor1/osrm-backend,yuryleb/osrm-backend,frodrigo/osrm-backend,Project-OSRM/osrm-backend,Project-OSRM/osrm-backend,frodrigo/osrm-backend,felixguendling/osrm-backend,yuryleb/osrm-backend,frodrigo/osrm-backend,yuryleb/osrm-backend,felixguendling/osrm-backend,yuryleb/osrm-backend,bjtaylor1/osrm-backend,Project-OSRM/osrm-backend,bjtaylor1/osrm-backend,bjtaylor1/osrm-backend