[Xcb] using enums as type in sync.xml

[Thomas Hunger]

Hello, 

sync.xml uses enums as types. This is readable, but a problem because

1) enums can have different binary sizes on different 
   platforms and depending on the range they cover. 

2) The size required in the X protocoll might not be the same 
   as the native platform enum size (this is very prominent in
   XKB which uses 1, 2 and 4 byte enumerations in X).

  <struct name="TRIGGER">
    <field type="COUNTER" name="counter" />
    <field type="VALUETYPE" name="wait_type" />
    <field type="INT64" name="wait_value" />
    <field type="TESTTYPE" name="test_type" />
  </struct>

An easy workaround is to define 

  <typedef newname="VALUETYPE" oldname="CARD32"/>
  <typedef newname="TESTTYPE" oldname="CARD32"/>

A patch is attached.

tom
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