fix compile

Geo/GFaceCompound.cpp

@@ -1133,6 +1133,7 @@ bool GFaceCompound::parametrize_conformal_spectral() const
   Msg::Error("https://geuz.org/trac/gmsh/wiki/STLRemeshing (username:gmsh,passwd:gmsh)     !");
   Msg::Error("-----------------------------------------------------------------------------!");
   Msg::Exit(1);
+  return false;
 
 }
 #else

Mesh/Field.cpp

@@ -1653,7 +1653,9 @@ FieldManager::FieldManager()
 {
   map_type_name["Structured"] = new FieldFactoryT<StructuredField>();
   map_type_name["Threshold"] = new FieldFactoryT<ThresholdField>();
+#if defined(HAVE_ANN)
   map_type_name["BoundaryLayer"] = new FieldFactoryT<BoundaryLayerField>();
+#endif
   map_type_name["Box"] = new FieldFactoryT<BoxField>();
   map_type_name["Cylinder"] = new FieldFactoryT<CylinderField>();
   map_type_name["LonLat"] = new FieldFactoryT<LonLatField>();