SMSS2 can be renamed to SMSS...

...indeed, Alex Ionescu rewrote some time ago the Session Manager SubSystem and
now, /base/system/smss2/ can be changed to /base/system/smss/ and one can apply
this change :

Index: /trunk/reactos/base/system/CMakeLists.txt
===================================================================
— /trunk/reactos/base/system/CMakeLists.txt (révision 57123)
+++ /trunk/reactos/base/system/CMakeLists.txt (copie de travail)
@@ -10,7 +10,7 @@
add_subdirectory(rundll32)
add_subdirectory(runonce)
add_subdirectory(services)
-add_subdirectory(smss2)
+add_subdirectory(smss)
add_subdirectory(subst)
add_subdirectory(userinit)
add_subdirectory(winlogon)