warning when compiling apr_atomic_casptr with gcc v4.1.2

[Martin Sustrik]

Hi all,

following code result in "warning: dereferencing type-punned pointer 
will break strict-aliasing rules" under gcc v4.1.2.

int main ()
{
    volatile int *i;
    apr_atomic_casptr ((volatile void **) &i, NULL, NULL);
    return 0;
}

Martin