Fixed plumed load in gmx 5.1 patch

With this change it looks I can solve an issue on my workstation
that has been reported on the mailing list (multiple linking
of Plumed.o object)

patches/gromacs-5.1.2.diff/src/gromacs/CMakeLists.txt

@@ -199,13 +199,17 @@ else()
 endif()
 set_source_files_properties(selection/scanner.cpp PROPERTIES COMPILE_FLAGS "${_scanner_cpp_compiler_flags}")
 
+target_link_libraries(libgromacs ${PLUMED_LOAD})
+
 target_link_libraries(libgromacs
                       ${EXTRAE_LIBRARIES}
                       ${GMX_EXTRA_LIBRARIES}
                       ${TNG_IO_LIBRARIES}
                       ${FFT_LIBRARIES} ${LINEAR_ALGEBRA_LIBRARIES}
                       ${XML_LIBRARIES}
-                      ${THREAD_LIB} ${GMX_SHARED_LINKER_FLAGS} ${OPENCL_LIBRARIES} ${PLUMED_LOAD})
+                      ${THREAD_LIB} ${GMX_SHARED_LINKER_FLAGS} ${OPENCL_LIBRARIES})
+
+
 set_target_properties(libgromacs PROPERTIES
                       OUTPUT_NAME "gromacs${GMX_LIBS_SUFFIX}"
                       SOVERSION ${LIBRARY_SOVERSION_MAJOR}