Update p5-Variable-Magic to 0.59.

0.59    2015-10-05 19:05 UTC
        + Chg : The magic callbacks are now always executed in a new stack.
                This should have no negative impact (performance-wise or
                behaviour-wise) on your code, but may actually fix some obscure
                bugs.
        + Fix : [RT #107294] : Crash during install of Variable-Magic-0.58
                running "t\18-opinfo.t".
                A recent change in the core implementation of transliterations
                caused an undefined behaviour when it interacted with this
                module, which resulted in visible stack corruption on Win32
                perls compiled with MSVC when the op_info feature was enabled.
                This was fixed by using a separate stack for the magic
                callbacks.
                Thanks Peter Stokes for reporting and providing greatly
                helpful feedback.
        + Fix : The object op_info feature will now handle correctly Unicode
                transliteration, multideref and custom ops.


(wiz)