Prevent users of swig bindings from assigning to const char * struct members so there won't be any memory leaks.
Prevent users of swig bindings from assigning to const char * struct
members so there won't be any memory leaks.

Patch by: Russell Yanofsky <rey4@columbia.edu>

* subversion/bindings/swig/core.i: made struct members which cause
  "Warning(451): Setting const char * member may leak memory" immutable.

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