simplify HAVE_GMSH_EMBEDDED

Common/Message.h

Geo/GEdge.cpp

Geo/GEdgeLoop.cpp

Geo/GEntity.cpp

Geo/GFace.cpp

Geo/GModel.cpp

Geo/GModelIO_CGNS.cpp

Geo/GModelIO_Geo.cpp

Geo/GModelIO_MED.cpp

Geo/GModelIO_Mesh.cpp

Geo/GRegion.cpp

Geo/GVertex.cpp

Geo/MElement.cpp

Geo/MFace.cpp

Geo/MVertex.cpp

Geo/discreteEdge.cpp

Geo/discreteFace.cpp

Geo/gmshFace.cpp

Graphics/Post.cpp

Graphics/gl2ps.cpp