[PATCH; python-imaging-sane] Py_*_ALLOW_THREADS for sane_get_devices and sane_open calls

Hi, following patch also adds Py_*_ALLOW_THREADS macros around the 
sane_get_devices and sane_open calls which can take a long time 
especially if network-scanners are accessed.

--- Imaging-1.1.7.orig/Sane/_sane.c    2009-11-01 01:44:12.000000000 +0100
+++ Imaging-1.1.7/Sane/_sane.c    2010-12-28 02:17:38.626022947 +0100
@@ -1162,8 +1162,9 @@
      {
        return NULL;
      }
-
+  Py_BEGIN_ALLOW_THREADS
    st=sane_get_devices(&devlist, local_only);
+  Py_END_ALLOW_THREADS
    if (st) return PySane_Error(st);
    if (!(list = PyList_New(0)))
          return NULL;
@@ -1191,7 +1192,9 @@
      rv = newSaneDevObject();
      if ( rv == NULL )
          return NULL;
+    Py_BEGIN_ALLOW_THREADS
      st = sane_open(name, &(rv->h));
+    Py_END_ALLOW_THREADS
      if (st)
        {
          Py_DECREF(rv);

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