intel/vk/grl: Allow grl/grl_cl_kernel.h to be included by C++ files

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21670>

src/intel/vulkan/grl/grl_cl_kernel_gen.py

@@ -36,13 +36,13 @@ TEMPLATE_H = Template(COPYRIGHT + """
 #ifndef GRL_CL_KERNEL_H
 #define GRL_CL_KERNEL_H
 
+#include "genxml/gen_macros.h"
+#include "compiler/brw_kernel.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include "genxml/gen_macros.h"
-#include "compiler/brw_kernel.h"
-
 enum grl_cl_kernel {
 % for k in kernels:
     GRL_CL_KERNEL_${k.upper()},