https://github.com/pocl/pocl/pull/1146

From 978afab0ba9f90fbdb39ed4ffc52f8ca46d2bfa9 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Mon, 5 Dec 2022 04:17:05 +0000
Subject: [PATCH] pocl-cuda: fix build with -DPOCL_DEBUG_MESSAGES=OFF
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Fixes build failure:
```
/var/tmp/portage2/portage/dev-libs/pocl-3.0/work/pocl-3.0/lib/CL/devices/cuda/pocl-cuda.c: In function ‘load_or_generate_kernel’:
/var/tmp/portage2/portage/dev-libs/pocl-3.0/work/pocl-3.0/lib/CL/devices/cuda/pocl-cuda.c:981:9: error: ‘pocl_debug_messages_filter’ undeclared (first use in this function)
  981 |   if (!(pocl_debug_messages_filter & POCL_DEBUG_FLAG_CUDA))
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
```

Bug: https://bugs.gentoo.org/862633
--- a/lib/CL/devices/cuda/pocl-cuda.c
+++ b/lib/CL/devices/cuda/pocl-cuda.c
@@ -1093,6 +1093,7 @@ load_or_generate_kernel (cl_kernel kernel, cl_device_id device,
   /* TODO: When can we unload the module? */
   CUmodule module;
 
+#ifdef POCL_DEBUG_MESSAGES
   if (!(pocl_debug_messages_filter & POCL_DEBUG_FLAG_CUDA))
     {
       result = cuModuleLoad (&module, ptx_filename);
@@ -1100,6 +1101,7 @@ load_or_generate_kernel (cl_kernel kernel, cl_device_id device,
     }
   else
     {
+#endif
       struct stat st;
       stat (ptx_filename, &st);
 
@@ -1132,7 +1134,9 @@ load_or_generate_kernel (cl_kernel kernel, cl_device_id device,
 
       free (log);
       free (buffer);
+#ifdef POCL_DEBUG_MESSAGES
     }
+#endif
 
   /* Get kernel function */
   CUfunction function;