Fix WML variable leak in RECRUIT_UNIT_VARIATIONS

changelog

@@ -18,6 +18,8 @@ Version 1.12.4+dev:
    * Fixed strict compilation with clang 3.5 and 3.6.
    * Fixed unbound memory read in internal time formatting code with
      specially-crafted input.
+   * Fixed RECRUIT_UNIT_VARIATIONS core WML macro leaking an internal temporary
+     variable ($recruited_unit_random_variation).
 
 Version 1.12.4:
  * Security fixes:

data/core/macros/utils.cfg

@@ -480,6 +480,8 @@
                 [/object]
             [/then]
         [/if]
+
+        {CLEAR_VARIABLE recruited_unit_random_variation}
     [/event]
 #enddef