unittest: reenable LWO import test.

test/CMakeLists.txt

@@ -94,7 +94,7 @@ SET( TEST_SRCS
   unit/utIssues.cpp
   unit/utJoinVertices.cpp
   unit/utLimitBoneWeights.cpp
-#  unit/utLWSImportExport.cpp
+  unit/utLWSImportExport.cpp
   unit/utMaterialSystem.cpp
   unit/utMatrix3x3.cpp
   unit/utMatrix4x4.cpp