[Patch] Evolution-Python - Add GIL state request/release when threads enabled

["Lauro Moura" <lauromoura gmail com>]

The callback created to handle EBookView signals wasn't requesting and
releasing the GIL, causing segmentations faults when threads were
enabled with gtk.gdk.threads_init().

This patch fix this by saving the GIL state and releasing right before
returning from the callback.

-- 
Lauro Moura ("lmoura" on Freenode)
http://lauro.wordpress.com

Index: src/ebook.override
===================================================================
--- src/ebook.override	(revision 49)
+++ src/ebook.override	(working copy)
@@ -476,7 +476,11 @@
     struct bookview_cb_t *data;
     int i;
     int extra_size;
+    PyGILState_STATE state;
 
+    /* Required for threaded code. No effect in single threads. */
+    state = pyg_gil_state_ensure();
+
     pybookview = pygobject_new(ebookview);
     if (pybookview == NULL){
     }
@@ -516,6 +520,8 @@
     Py_XDECREF(pybookview);
     Py_XDECREF(list); /* Will decref its childs too? */
 
+    pyg_gil_state_release(state);
+
     return;
 }