ClangFormat: apply to source, most of intern

Apply clang format as proposed in T53211.

For details on usage and instructions for migrating branches
without conflicts, see:

https://wiki.blender.org/wiki/Tools/ClangFormat

source/blender/python/gpu/gpu_py_vertex_buffer.h

@@ -25,12 +25,12 @@
 
 extern PyTypeObject BPyGPUVertBuf_Type;
 
-#define BPyGPUVertBuf_Check(v)        (Py_TYPE(v) == &BPyGPUVertBuf_Type)
+#define BPyGPUVertBuf_Check(v) (Py_TYPE(v) == &BPyGPUVertBuf_Type)
 
 typedef struct BPyGPUVertBuf {
-	PyObject_VAR_HEAD
-	/* The buf is owned, we may support thin wrapped batches later. */
-	struct GPUVertBuf *buf;
+  PyObject_VAR_HEAD
+      /* The buf is owned, we may support thin wrapped batches later. */
+      struct GPUVertBuf *buf;
 } BPyGPUVertBuf;
 
 PyObject *BPyGPUVertBuf_CreatePyObject(struct GPUVertBuf *vbo) ATTR_NONNULL(1);