[libc] Add CodeSourcery G++ lite check.

components/cplusplus/crt_init.c

@@ -33,7 +33,8 @@ void $Sub$$__cpp_initialize__aeabi_(void)
 {
     /* empty */
 }
-#elif defined(__GNUC__)
+#elif defined(__GNUC__) && !defined(__CS_SOURCERYGXX_MAJ__)
+/* The _init()/_fini() routines has been defined in codesourcery g++ lite */
 void _init()
 {
 }