Fix gcc test in Kernel link line.

It needs to catch all of 4.4 so restricts to > 4.5
Refs #7798

Code/Mantid/Framework/Kernel/CMakeLists.txt

@@ -366,7 +366,7 @@ set_property ( TARGET Kernel PROPERTY FOLDER "MantidFramework" )
 # 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
 if ( GCC_COMPILER_VERSION )
-  if ( GCC_COMPILER_VERSION VERSION_GREATER "4.4" )
+  if ( GCC_COMPILER_VERSION VERSION_GREATER "4.5" )
     target_link_libraries ( Kernel ${TCMALLOC_LIBRARY} stdc++ )
   else ()
     target_link_libraries ( Kernel stdc++ ${TCMALLOC_LIBRARY} )