cmake DEAL_II_SCALAPACK_HAS_PDSYEVR_PSSYEVR examples

dealii/dealii cmake/configure/configure_50_scalapack.cmake :32 

CHECK_CXX_SOURCE_COMPILES("
        extern \"C\" void pdsyevr_();
        extern \"C\" void pssyevr_();
        int main(){
          pdsyevr_();
          pssyevr_();
          return 0;
        }"
        DEAL_II_SCALAPACK_HAS_PDSYEVR_PSSYEVR)