These are cut down versions of wine headers containing only what is necessary
for WOW. This shouldn't carry any license implications for FEX, as per the
LGPLv3 license:
```
The object code form of an Application may incorporate material from a header
file that is part of the Library. You may convey such object code under terms
of your choice, provided that, if the incorporated material is not limited to
numerical parameters, data structure layouts and accessors, or small macros,
inline functions and templates (ten or fewer lines in length), you do both of
the following:
a) Give prominent notice with each copy of the object code that the Library is
used in it and that the Library and its use are covered by this License.
b) Accompany the object code with a copy of the GNU GPL and this license
document.
```
Billy Laws