Make the cast more robust to sneak it past -Werror.

Signed-off-by: Eric Schweitz <[email protected]>

runtime/common/ThunkInterface.h

@@ -29,9 +29,16 @@ using KernelDegenerateType = void (*)(void *);
 /// In some cases, the launcher will bypass the thunk function and call a
 /// degenerate stub. That means that the extra `bool` argument will be ignored
 /// by the called kernel and the kernel will not return a dynamic result.
+///
+/// This is a terrible idea, generally speaking. However, if the launcher
+/// neither looks for nor attempts to use the second `bool` argument at all, and
+/// the launcher will drop any results returned from the kernel (regardless of
+/// type) on the floor anyway, then one may be able to get away with using a
+/// degenerate kernel type.
 inline KernelDegenerateType
 make_degenerate_kernel_type(KernelThunkType func_type) {
-  return reinterpret_cast<KernelDegenerateType>(func_type);
+  return reinterpret_cast<KernelDegenerateType>(
+      reinterpret_cast<void *>(func_type));
 }
 
 } // namespace cudaq