* c14n.c: Fixing #74186, made sure all boolean expressions
  get fully parenthesized, ran indent on the output
* configure.in HTMLtree.c SAX.c c14n.c debugXML.c tree.c xpointer.c
  include/libxml/tree.h: also #74186 related, removed the
  --with-buffers option, and all the preprocessor conditional
  sections that were resulting from it.
Daniel