[xml] Some problems with conditional defines

[Eric Zurcher csiro au]

Daniel,

While testing the current CVS version, I noticed that it is not possible to
compile libxml2 with regexp and automata support disabled. Specifically,
valid.c will not compile because it references at several points (in
xmlValidatePushElement, xmlValidatePushCData, and xmlValidatePopElement)
elements "elemDecl" and "exec" within struct _xmlValidState, but these
elements are defined within the struct only if LIBXML_REGEXP_ENABLED is
defined.

Eric Zurcher
CSIRO Livestock Industries
Canberra, Australia
Eric Zurcher csiro au