Python: move remaining python files to C++

Also see #103343.

Pull Request: https://projects.blender.org/blender/blender/pulls/110352

source/blender/python/gpu/gpu_py_vertex_buffer.h

@@ -10,6 +10,10 @@
 
 #include "BLI_compiler_attrs.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern PyTypeObject BPyGPUVertBuf_Type;
 
 #define BPyGPUVertBuf_Check(v) (Py_TYPE(v) == &BPyGPUVertBuf_Type)
@@ -21,3 +25,7 @@ typedef struct BPyGPUVertBuf {
 } BPyGPUVertBuf;
 
 PyObject *BPyGPUVertBuf_CreatePyObject(struct GPUVertBuf *buf) ATTR_NONNULL(1);
+
+#ifdef __cplusplus
+}
+#endif