Realm: warnings when compiling with cuda 12.8

[eddy16112]

We have seen many warnings when compiling Realm with CUDA 12.8, e.g.

In file included from /home/scratch.weiwu_sw/anaconda3/envs/cuda128/x86_64-conda-linux-gnu/sysroot/usr/include/limits.h:26,
                 from /home/scratch.weiwu_sw/anaconda3/envs/cuda128/lib/gcc/x86_64-conda-linux-gnu/11.2.0/include-fixed/limits.h:203,
                 from /home/scratch.weiwu_sw/anaconda3/envs/cuda128/lib/gcc/x86_64-conda-linux-gnu/11.2.0/include-fixed/syslimits.h:7,
                 from /home/scratch.weiwu_sw/anaconda3/envs/cuda128/lib/gcc/x86_64-conda-linux-gnu/11.2.0/include-fixed/limits.h:34,
                 from /home/weiwu/scratch/legion-master/runtime/realm/profiling.h:21,
                 from /home/weiwu/scratch/legion-master/runtime/realm/profiling.cc:18:
/home/scratch.weiwu_sw/anaconda3/envs/cuda128/x86_64-conda-linux-gnu/sysroot/usr/include/features.h:330:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
  330 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)

/home/weiwu/scratch/legion-master/runtime/realm/activemsg.inl:382:10: warning: unused variable 'ok' [-Wunused-variable]
  382 |     bool ok = fbs.append_bytes(data, datalen);

These warnings come from the following pattern

bool ok = foo();
assert(ok);

The assert will be optimized in release mode, not sure why it is not triggered before.
I create this ticket to remind myself to fix it later.

[muraj]

Check if NDEBUG is being defined.