Add changes to parser.h header file due to Bison version change from 2.3 to 2.5.
Add changes to parser.h header file due to Bison version change from 2.3 to
2.5.

  * FIXME There is still a missing typedef for the pxpathPtr struct.

isislovecruft/pyparsley,isislovecruft/pyparsley,isislovecruft/pyparsley,isislovecruft/pyparsley,isislovecruft/pyparsley