[PR] cmake: use enumerations for possible values, so that cmake-gui offersa drop-down selection [xerces-c]

dilyanpalauzov opened a new pull request, #57:
URL: https://github.com/apache/xerces-c/pull/57

   I have read on https://xerces.apache.org/xerces-c/source-repository.html that Jira.apache is the preferred way for submitting changesets, but it is unclear how long getting an account there will take.
   
   The current change allows the cmake-gui (like `ccmake`) to offer the  user a fixed enumeration of possible values, so that the user can select one from a drop-down menu.  In case of `ccmake` the possible values are toggled by pressing enter and it is not anymore possible for the user to enter text as value.
   
   I have very basic knowledge about cmake, so there might be a different way to achieve the same result.  If a different way is preferred, please go forward with it, without asking me to adopt it.


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