Cleanup: add semicolon after PyObject_VAR_HEAD

clang-format doesn't expand macros,
add semicolon to prevent misleading formatting.

source/blender/python/gpu/gpu_py_element.h

@@ -26,7 +26,8 @@ extern PyTypeObject BPyGPUIndexBuf_Type;
 #define BPyGPUIndexBuf_Check(v) (Py_TYPE(v) == &BPyGPUIndexBuf_Type)
 
 typedef struct BPyGPUIndexBuf {
-  PyObject_VAR_HEAD struct GPUIndexBuf *elem;
+  PyObject_VAR_HEAD;
+  struct GPUIndexBuf *elem;
 } BPyGPUIndexBuf;
 
 PyObject *BPyGPUIndexBuf_CreatePyObject(struct GPUIndexBuf *elem);