Fix namespaces.

code/AssetLib/SMD/SMDLoader.cpp

@@ -64,9 +64,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define strtok_s strtok_r
 #endif
 
-using namespace Assimp;
+namespace Assimp {
 
-static const aiImporterDesc desc = {
+static constexpr aiImporterDesc desc = {
     "Valve SMD Importer",
     "",
     "",
@@ -1077,4 +1077,6 @@ void SMDImporter::ParseVertex(const char* szCurrent,
     SMDI_PARSE_RETURN;
 }
 
+}
+
 #endif // !! ASSIMP_BUILD_NO_SMD_IMPORTER