xmllint was not parsing the --c14n11 flag

Cut and paste error, using the wrong variable
Fix typos in relaxng.c

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>
configure: Add --with-python-install-dir

Cross-compiling the python bindings is a bit difficult today, as the
configure script will figure out the site packages dir
(PYTHON_SITE_PACKAGES) by either:

- Generating the path to the site-package target directories using
  libdir, and see if it exists. As it is not possible to point to the
  full path of the sysroot, since that will yield the wrong install
  path, and that the directory does not neccessarily exist on the host,
  this approach will not work.

- Fetch the site packages dir from the python interpreter as pointed to
  by --with-python. Since this python interpreter will point to the
  sysroot, the install dir generated will be inside the sysroot and thus
  not work.

This patch approaches the problem by adding the possibility of
explicitly stating the install dir of the python packages, leaving it up
to the cross-compilation environment to specify it. The patch does not
affect the default case (non-cross compilation).

Signed-off-by: Jonas Eriksson <jonas.eriksson@enea.com>
erroneously ignores a validation error if no error callback set

Reported by Stefan Behnel
https://bugzilla.gnome.org/show_bug.cgi?id=724903
Merge branch 'master' of git://git.gnome.org/libxml2 into os400