Codechange: Replace old non-standard attributes with C++17/20 standard attributes.

src/core/alloc_func.cpp

@@ -17,7 +17,7 @@
  * Function to exit with an error message after malloc() or calloc() have failed
  * @param size number of bytes we tried to allocate
  */
-void NORETURN MallocError(size_t size)
+[[noreturn]] void MallocError(size_t size)
 {
 	FatalError("Out of memory. Cannot allocate {} bytes", size);
 }
@@ -26,7 +26,7 @@ void NORETURN MallocError(size_t size)
  * Function to exit with an error message after realloc() have failed
  * @param size number of bytes we tried to allocate
  */
-void NORETURN ReallocError(size_t size)
+[[noreturn]] void ReallocError(size_t size)
 {
 	FatalError("Out of memory. Cannot reallocate {} bytes", size);
 }