Cycles: HIP search for ROCm 6 driver

This should be backwards compatible, and is more future proof
for future driver releases.

Pull Request: https://projects.blender.org/blender/blender/pulls/118944

extern/hipew/src/hipew.c

@@ -233,7 +233,7 @@ static int hipewHipInit(void) {
   /* Library paths. */
 #ifdef _WIN32
   /* Expected in C:/Windows/System32 or similar, no path needed. */
-  const char *hip_paths[] = {"amdhip64.dll", NULL};
+  const char *hip_paths[] = {"amdhip64.dll", "amdhip64_6.dll", NULL};
 
 #elif defined(__APPLE__)
   /* Default installation path. */