Build without hwloc broken on master

The build was broken by #11366, which used `#ifdef TS_USE_HWLOC` to check whether HWLOC was enabled. `TS_USE_HWLOC` is always defined to 0 or 1, so this will never evaluate to false when checked by the preprocessor. It should be `#if TS_USE_HWLOC`, as is done everywhere else in the codebase. I grepped for `#ifdef TS_USE` and found that this is is the only occurance in the codebase of this issue.