Cleanup: add semicolon after PyObject_VAR_HEAD

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

source/blender/python/generic/bgl.h

@@ -33,7 +33,8 @@ int BGL_typeSize(int type);
  * For Python access to OpenGL functions requiring a pointer.
  */
 typedef struct _Buffer {
-  PyObject_VAR_HEAD PyObject *parent;
+  PyObject_VAR_HEAD;
+  PyObject *parent;
 
   int type; /* GL_BYTE, GL_SHORT, GL_INT, GL_FLOAT */
   int ndimensions;