Path: make export macro accessible in header file

It's not recommended any more to keep the export macro in the PreCompiled.h because many IDEs fail to fetch the export macro and raise a parsing error instead.

src/Mod/Path/PathGlobal.h

@@ -44,4 +44,13 @@
 #endif
 #endif
 
+// PathSimulator
+#ifndef PathSimulatorExport
+#ifdef PathSimulator_EXPORTS
+#  define PathSimulatorExport      FREECAD_DECL_EXPORT
+#else
+#  define PathSimulatorExport      FREECAD_DECL_IMPORT
+#endif
+#endif
+
 #endif //PATH_GLOBAL_H

src/Mod/Path/PathSimulator/App/PreCompiled.h

@@ -25,19 +25,6 @@
 
 #include <FCConfig.h>
 
-// Exporting of App classes
-#ifdef FC_OS_WIN32
-# define PathSimulatorExport __declspec(dllexport)
-# define PathExport  __declspec(dllimport)
-# define PartExport __declspec(dllimport)
-# define MeshExport __declspec(dllimport)
-#else // for Linux
-# define PathSimulatorExport
-# define PathExport
-# define PartExport
-# define MeshExport
-#endif
-
 #ifdef _PreComp_
 
 // standard