compilation error with new intel compilers

[ksebaz]

with the new intel compilers (icx, icpx) one runs into the following type of errors:

[  141s] /home/abuild/rpmbuild/BUILD/complexespp-main/complexes++/src/mc/npt.cpp:164:13: error: explicit comparison with NaN in fast floating point mode [-Werror,-Wtautological-constant-compare]
[  141s]         if (std::isnan(enDelta) || std::isinf(enDelta)) {

One could change the fp-model or include some flags to make the compiler honor these checks even with the default 'fast' but I think this would require a new section in the CMakeLists.txt since the compiler id is now 'IntelLLVM' and the flags might be different from the classic compiler.