problem: trying to link against librt on macOS #4702
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Solution: don't use rt if not `RT_LIBRARY`
This currently causes the check to fail on macOS:
```bash
/Library/Developer/CommandLineTools/usr/bin/c++ -std=c++11 -Wno-tautological-constant-compare -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX14.4.sdk -Wl,-search_paths_first -Wl,-headerpad_max_install_names CMakeFiles/cmTC_8466b.dir/CheckSymbolExists.cxx.o -o cmTC_8466b -lrt
ld: library 'rt' not found
clang: error: linker command failed with exit code 1 (use -v to see invocation)
```
even though `clock_gettime` is available.
Move the `clock_gettime` check up with the other librt related checks,
and don't set `CMAKE_REQUIRED_LIBRARIES` if not `RT_LIBRARY`.
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Solution: don't use
rtif notRT_LIBRARYThis currently causes the check to fail on macOS:
even though
clock_gettimeis available.Move the
clock_gettimecheck up with the other librt related checks, and don't setCMAKE_REQUIRED_LIBRARIESif notRT_LIBRARY.