import blendshapes with correct settings in 2018.4 as well

Author: vkovec

com.unity.formats.fbx/Tests/FbxTests/ModelExporterTest.cs

@@ -564,7 +564,13 @@ private string ExportSkinnedMesh(string fileToExport, out SkinnedMeshRenderer or
             importer.importBlendShapeNormals = ModelImporterNormals.None;
             importer.weldVertices = true;
 #else
+            importer.importBlendShapes = true;
             importer.optimizeMesh = false;
+            importer.meshCompression = ModelImporterMeshCompression.Off;
+            // If either blendshape normals are imported or weldVertices is turned off (or both),
+            // the vertex count between the original and exported meshes does not match.
+            importer.importBlendShapeNormals = ModelImporterNormals.None;
+            importer.weldVertices = true;
 #endif // UNITY_2019_1_OR_NEWER
             importer.SaveAndReimport();