Fix build with clang 6

/wrkdirs/usr/ports/graphics/opencollada/work/OpenCOLLADA-1.6.47/COLLADAStreamWriter/src/COLLADASWLibraryAnimations.cpp:65:79: error: no matching constructor for initialization of 'std::vector<Animation *>'

: Library ( streamWriter, CSWC::CSW_ELEMENT_LIBRARY_ANIMATIONS ), mOpenAnimations ( NULL )
                                                                  ^                 ~~~~

PR: 224669
Reported by: pkg-fallout
Reviewed by: rakuco@