Cleanup: Move customdata.c to C++

Differential Revision: https://developer.blender.org/D13666

source/blender/blenkernel/CMakeLists.txt

@@ -126,7 +126,7 @@ set(SRC
   intern/curve_eval.cc
   intern/curve_to_mesh_convert.cc
   intern/curveprofile.cc
-  intern/customdata.c
+  intern/customdata.cc
   intern/customdata_file.c
   intern/data_transfer.c
   intern/deform.c

source/blender/blenkernel/intern/data_transfer_intern.h

@@ -25,6 +25,10 @@
 
 #include "BKE_customdata.h" /* For cd_datatransfer_interp */
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct CustomData;
 struct CustomDataTransferLayerMap;
 struct ListBase;
@@ -78,3 +82,7 @@ void customdata_data_transfer_interp_normal_normals(const CustomDataTransferLaye
                                                     const float *weights,
                                                     const int count,
                                                     const float mix_factor);
+
+#ifdef __cplusplus
+}
+#endif