[SPEC2017] Add dependencies required for compiletime measurements to the wrf_netcdf target of 521.wrf_r

[SixWeining]

Without this change, Fortran benchmarks of SPEC2017 fail to build. Steps to reproduce:

$ cmake -B builddir \
-DCMAKE_C_COMPILER=clang \
-DCMAKE_CXX_COMPILER=clang++ \
-DCMAKE_Fortran_COMPILER=flang \
-G Ninja \
-C cmake/caches/O3.cmake \
-DTEST_SUITE_SPEC2017_ROOT=path/to/cpu2017-v1.1.5 \ -DTEST_SUITE_RUN_TYPE=ref \
-DTEST_SUITE_FORTRAN=ON \
-DCMAKE_C_FLAGS=-Wno-implicit-int \
-DCMAKE_CXX_FLAGS=-Wno-implicit-int

$ cmake --build builddir/ -j1
[0/2] Re-checking globbed directories...
[1951/35275] Building C object External/SPEC/CFP2017rate/521.wrf_r/CMakeFiles/wrf_netcdf.dir/__/__/cpu2017-v1.1.5/benchspec/CPU/521.wrf_r/src/netcdf/attr.c.o FAILED:
...
/bin/sh: 1: builddir/tools/timeit: not found

[lukel97]

LGTM, thanks. I presume it's because this fortran library doesn't use llvm_test_library? And FWIW I can see SNAP also does the same thing