add cmath for std::nextafter
add cmath for std::nextafter

Change-Id: Ic5580d5efb9d5a891a62630dc457624ba89c15a2

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core