Ignores syntax error in $(SOURCE_DIR)/src/lxml/lxml.etree.pyx.

We need to see if this patch is still needed with the very latest version
of pylxml, and if so, send it upstream.

--- lxml-3.6.4/test.py_orig	2017-01-11 14:03:08.523061540 +0000
+++ lxml-3.6.4/test.py	2017-01-11 14:03:27.417867156 +0000
@@ -606,14 +606,6 @@
             walker = os.path.walk
         walker(os.path.abspath(cfg.basedir), add_file, None)
 
-        try:
-            cov.xml_report(modules, outfile='coverage.xml')
-            if cfg.coverdir:
-                cov.html_report(modules, directory=cfg.coverdir)
-        finally:
-            # test runs can take a while, so at least try to print something
-            cov.report()
-
     # That's all
     if success:
         return 0