Optimised kernels won't compile if Architecture is noarch

The toolkit should stop processing if Architecture=="noarch" but optimisation="optimised" is selected and raise an error, instead of building nonworking code which won't compile. Otherwise, users will be confronted with C compiler errors like

/zhome/academic/HLRS/xfp/xfpskoep/ExaHyPE/Engine/./AstroApplications/CCZ4GRMHD/AbstractCCZ4GRMHDSolver_ADERDG.h(257): error: identifier "ALIGNMENT" is undefined
      inline double* allocateArray(const int size) {return ((double* ) _mm_malloc(sizeof(double)*size, ALIGNMENT));}

                               ^

/zhome/academic/HLRS/xfp/xfpskoep/ExaHyPE/Engine/./AstroApplications/CCZ4GRMHD/AbstractCCZ4GRMHDSolver_ADERDG.cpp(89): error: identifier "ALIGNMENT" is undefined
    double tempUpdate[CCZ4GRMHD::CCZ4GRMHDSolver_ADERDG_kernels::aderdg::getUpdateSize()] __attribute__((aligned(ALIGNMENT))); // TODO no heap variant implemented

                                          ^ 

which are hard to understand.