CI: Fix use of the built-in XercesC build.

dependencies/SetupJSON.cmake

@@ -7,7 +7,7 @@
 
 # Configuration option for how "nlohmann_json" should be used.
 option( GEOMODEL_USE_BUILTIN_JSON
-   "Download a version of nlohmann_json during the build" FALSE )
+"Download and compile a version of nlohmann_json during the build" FALSE )
 
 # Now do what was requested.
 if( GEOMODEL_USE_BUILTIN_JSON )

dependencies/SetupXercesC.cmake

@@ -14,6 +14,13 @@ if( GEOMODEL_USE_BUILTIN_XERCESC )
    # Tell the user what's happening.
    message( STATUS "Building XercesC as part of the project" )
 
+   # Tell the user what's happening.
+   if( COLOR_DEFS )
+     message( STATUS "${BoldMagenta}'GEOMODEL_USE_BUILTIN_XERCESC' was set to 'true' ==> Building XercesC as part of the project${ColourReset}" )
+   else()
+     message( STATUS "'GEOMODEL_USE_BUILTIN_XERCESC' was set to 'true' ==> Building XercesC as part of the project" )
+   endif()
+
    # The include directory and library that will be produced.
    set( XercesC_INCLUDE_DIR
       "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/XercesCInstall/${CMAKE_INSTALL_INCLUDEDIR}" )