api/cl.xml: remove duplicate definition

The cl_queue_priority_khr enum was defined twice. Remove the first copy,
which incidentally had an extra double-quote symbol in it, which
hindered XML parsing.

api/cl.xml

diff --git a/api/cl.xml b/api/cl.xml
index 40290e3..4f341ea 100644
--- a/api/cl.xml
+++ b/api/cl.xml
@@ -303,13 +303,6 @@
         <enum value="(1<<0)"    name="CL_QUEUE_PRIORITY_HIGH_KHR"/>
         <enum value="(1<<1)"    name="CL_QUEUE_PRIORITY_MED_KHR"/>
         <enum value="(1<<2)"    name="CL_QUEUE_PRIORITY_LOW_KHR"/>
-            <unused start="1<<3" end="1="<<31"/>
-    </enums>
-
-    <enums namespace="CL" group="cl_queue_priority_khr" vendor="Khronos" type="bitmask">
-        <enum value="(1<<0)"    name="CL_QUEUE_PRIORITY_HIGH_KHR"/>
-        <enum value="(1<<1)"    name="CL_QUEUE_PRIORITY_MED_KHR"/>
-        <enum value="(1<<2)"    name="CL_QUEUE_PRIORITY_LOW_KHR"/>
             <unused start="1<<3" end="1<<31"/>
     </enums>