BaseTools: Sort file list in Makefile

This patch is going to sort the file list in generated
Makefile. This change make the autogen makefile easy to
compare.

Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>

BaseTools/Source/Python/AutoGen/GenMake.py

@@ -1026,7 +1026,8 @@ cleanlib:
                         self.FileListMacros[T.FileListMacro].append(NewFile)
                     else:
                         Deps.append(NewFile)
-
+                for key in self.FileListMacros:
+                    self.FileListMacros[key].sort()
                 # Use file list macro as dependency
                 if T.GenFileListMacro:
                     Deps.append("$(%s)" % T.FileListMacro)