fix build with geos 3.11.

https://github.com/pcb2gcode/pcb2gcode/commit/f7b93da36eb607f92b4d35ea576658ae008ca6a5

Index: geos_helpers.cpp
--- geos_helpers.cpp.orig
+++ geos_helpers.cpp
@@ -3,13 +3,10 @@
 #include "geos_helpers.hpp"
 #include "geometry.hpp"
 #include <geos/io/WKTReader.h>
-#include <geos/io/WKTReader.inl>
 #include <geos/io/WKTWriter.h>
 #include <geos/geom/CoordinateSequenceFactory.h>
 #include <geos/geom/Coordinate.h>
-#include <geos/geom/Coordinate.inl>
 #include <geos/geom/GeometryFactory.h>
-#include <geos/geom/GeometryFactory.inl>
 #include <boost/pointer_cast.hpp>
 
 linestring_type_fp from_geos(const geos::geom::LineString* ls) {
