[PATCH] [RUBY] GC fixes

This patch fixes problems with the bindings when the garbage collector runs.
[[[

Track batons better so that they don't get lost when the garbage collector runs.

* subversion/bindings/swig/ruby/libsvn_swig_ruby/swigutil_rb.c
 (rb_pool_new) initialize the array to store batons that are in use.
 (svn_swig_rb_make_baton) save every baton created into the current pool so
       there is always at least one reference to it.
 (svn_swig_rb_from_baton) check that a baton is still valid before
trying to use it.

]]]

--
When I do good, I feel good;  when I do bad, I feel bad,
and that is my religion.
    -- Abraham Lincoln (1809 - 1865)

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