(Merge 3.4) Issue #12328, #20978: Add _winapi.WAIT_ABANDONED_0 symbol, needed

by multiprocessing.connection

Modules/_winapi.c

@@ -1343,6 +1343,7 @@ PyInit__winapi(void)
     WINAPI_CONSTANT(F_DWORD, STILL_ACTIVE);
     WINAPI_CONSTANT(F_DWORD, SW_HIDE);
     WINAPI_CONSTANT(F_DWORD, WAIT_OBJECT_0);
+    WINAPI_CONSTANT(F_DWORD, WAIT_ABANDONED_0);
     WINAPI_CONSTANT(F_DWORD, WAIT_TIMEOUT);
 
     WINAPI_CONSTANT("i", NULL);