[feature][flow] Add a common executable for all flow variants, i.e.

flow_ebos, flow_ebos_polymer, flow_ebos_solvent, flow_ebos_2p.

CMakeLists.txt

@@ -130,9 +130,3 @@ endif (NOT EIGEN3_FOUND)
 if (HAVE_OPM_DATA)
     include (${CMAKE_CURRENT_SOURCE_DIR}/compareECLFiles.cmake)
 endif()
-
-# create a symbolic link from flow to flow_legacy
-ADD_CUSTOM_TARGET(flow ALL
-                  DEPENDS flow_ebos
-                  COMMAND ${CMAKE_COMMAND} -E create_symlink "flow_ebos" "${CMAKE_BINARY_DIR}/bin/flow")
-install(FILES ${CMAKE_BINARY_DIR}/bin/flow DESTINATION bin)