Only build collada test when importer/exporter is build (#6411)

See-also: https://bugs.gentoo.org/962559

Signed-off-by: Paul Zander <negril.nx+gentoo@gmail.com>

test/CMakeLists.txt

@@ -147,8 +147,6 @@ SET( IMPORTERS
   unit/utBlendImportMaterials.cpp
   unit/utBlenderWork.cpp
   unit/utBVHImportExport.cpp
-  unit/utColladaExport.cpp
-  unit/utColladaImportExport.cpp
   unit/utCSMImportExport.cpp
   unit/utB3DImportExport.cpp
   #unit/utM3DImportExport.cpp
@@ -180,6 +178,18 @@ if(ASSIMP_BUILD_USD_IMPORTER)
   )
 endif()
 
+if(ASSIMP_BUILD_COLLADA_EXPORTER)
+  list( APPEND IMPORTERS
+    unit/utColladaExport.cpp
+  )
+endif()
+
+if(ASSIMP_BUILD_COLLADA_IMPORTER)
+  list( APPEND IMPORTERS
+    unit/utColladaImportExport.cpp
+  )
+endif()
+
 SET( MATERIAL
   unit/utMaterialSystem.cpp
 )