transform.h: remove extern "C" (#2755)

selfdrive/modeld/transforms/transform.h

@@ -1,5 +1,4 @@
-#ifndef TRANSFORM_H
-#define TRANSFORM_H
+#pragma once
 
 #include <inttypes.h>
 #include <stdbool.h>
@@ -13,10 +12,6 @@
 
 #include "common/mat.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 typedef struct {
   cl_kernel krnl;
   cl_mem m_y_cl, m_uv_cl;
@@ -31,9 +26,3 @@ void transform_queue(Transform* s, cl_command_queue q,
                      cl_mem out_y, cl_mem out_u, cl_mem out_v,
                      int out_width, int out_height,
                      mat3 projection);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif  // TRANSFORM_H