Ev2 shims: Make sure we rel-pathify the value provided in the copyfrom_url when fetching the props from the shim callbacks.  This should fix the last of the relpath-related Ev2 test failures.
Ev2 shims: Make sure we rel-pathify the value provided in the copyfrom_url when
fetching the props from the shim callbacks.  This should fix the last of the
relpath-related Ev2 test failures.

* subversion/libsvn_delta/compat.c
  (build): Calculate the correct relpath for interacting with the shim props
    callback.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion