Add definitions to support Boolean values in the Expat API.
Add definitions to support Boolean values in the Expat API.

tiran/expat,libexpat/libexpat,tiran/expat,libexpat/libexpat,tiran/expat,libexpat/libexpat,libexpat/libexpat,tiran/expat,libexpat/libexpat,libexpat/libexpat