CMake warning on configuration

[NHOrus]

Some packaging systems flag this.

CMake Warning (dev) at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:438 (message):
  The package name passed to `find_package_handle_standard_args`
  (XKBCommon_KeySyms) does not match the name of the calling package
  (XKBCommon).  This can lead to problems in calling code that expects
  `find_package` result variables (e.g., `_FOUND`) to follow a certain
  pattern.
Call Stack (most recent call first):
  cmake/Utilities.cmake:189 (find_package_handle_standard_args)
  cmake/modules/FindXKBCommon.cmake:46 (find_package_handle_library_components)
  CMakeLists.txt:57 (find_package)
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