Fix Python bindings under Windows

- Correct linker flags for MinGW-w64
- Adjust PATH to find libxml2.dll when running tests

configure.ac

@@ -1620,7 +1620,14 @@ case "$host" in
  WIN32_EXTRA_LDFLAGS="-no-undefined"
  if test "${PYTHON}" != ""
  then
-   WIN32_EXTRA_PYTHON_LIBADD="-L${pythondir}/../../libs -lpython$(echo ${PYTHON_VERSION} | tr -d .)"
+   case "$host" in
+     *-w64-mingw*)
+       WIN32_EXTRA_PYTHON_LIBADD="-shrext .pyd -L${pythondir}/../../lib -lpython${PYTHON_VERSION}"
+       ;;
+     *)
+       WIN32_EXTRA_PYTHON_LIBADD="-L${pythondir}/../../libs -lpython$(echo ${PYTHON_VERSION} | tr -d .)"
+       ;;
+   esac
  fi
  ;;
  *-*-cygwin*)

python/tests/Makefile.am

@@ -66,6 +66,7 @@ tests: $(PYTESTS)
 	   export PYTHONPATH; \
 	   LD_LIBRARY_PATH="$(top_builddir)/.libs:$$LD_LIBRARY_PATH" ; \
 	   export LD_LIBRARY_PATH; \
+	   export PATH="$(top_builddir)/.libs:$$PATH" ; \
 	   for test in $(PYTESTS) ; \
 	   do log=`$(PYTHON) $(srcdir)/$$test` ; \
 	   if [ "`echo $$log | grep OK`" = "" ] ; then \