Also place NeXus first in linker list in Kernel for gcc 4.4

If it is not after stdc++ then we get a crash in Python when accessing
the C api.
Refs #7798

Code/Mantid/Framework/Kernel/CMakeLists.txt

@@ -363,13 +363,15 @@ set_target_properties ( Kernel PROPERTIES OUTPUT_NAME MantidKernel
 set_property ( TARGET Kernel PROPERTY FOLDER "MantidFramework" )
 
 # Using gcc, for tcmalloc to report the correct memory usage we must link it first.
-# However, if we do not put stdc++ first on gcc 4.4 systems then things crash when an exceptions are thrown in Python
-# If we are not using tcmalloc then the variable is empty and it makes no difference
+# However, if we do not put stdc++ first on gcc 4.4 systems then things crash when an
+# exceptions are thrown in Python and if libnexus is not second then we get a crash when
+# accessing the nexus C api.
+# If we are not using tcmalloc then the variable is empty and it makes no difference.
 if ( GCC_COMPILER_VERSION )
   if ( GCC_COMPILER_VERSION VERSION_GREATER "4.5" )
     target_link_libraries ( Kernel ${TCMALLOC_LIBRARY} stdc++ )
   else ()
-    target_link_libraries ( Kernel stdc++ ${TCMALLOC_LIBRARY} )
+    target_link_libraries ( Kernel stdc++ ${NEXUS_C_LIBRARIES} ${TCMALLOC_LIBRARY} )
   endif()
 endif()