Remove calls to deprecated serd_uri_to_path

[donpellegrino]

RDFParserSerd.cpp is calling a deprecated serd_uri_to_path function.

src/rdf/RDFParserSerd.cpp:188:23: warning: 'serd_uri_to_path' is deprecated [-Wdeprecated-declarations]
        const uint8_t* input=serd_uri_to_path((const uint8_t *)fileName);
                             ^~~~~~~~~~~~~~~~
                             serd_file_uri_parse
/opt/serd/include/serd-0/serd/serd.h:267:1: note: 'serd_uri_to_path' has been explicitly marked deprecated
      here
SERD_DEPRECATED_BY("serd_file_uri_parse")
^
/opt/serd/include/serd-0/serd/serd.h:66:52: note: expanded from macro 'SERD_DEPRECATED_BY'
#    define SERD_DEPRECATED_BY(rep) __attribute__((deprecated("", rep)))
                                                   ^

[mielvds]

There are some stale unmerged serd branches:

• https://github.com/rdfhdt/hdt-cpp/tree/serd-gzip
• https://github.com/rdfhdt/hdt-cpp/tree/serd1

Maybe the last one is helpful? @drobilla ?

[drobilla]

As the warning says, serd_file_uri_parse is the non-broken/deprecated version to use. It has been in releases for years, nothing to do with any pending branches.