If you are using matlab, just find the line of code that is displaying this information (usually using 'disp', 'sprintf', or 'fprintf') and comment it out using the commenting operator %.
example:
disp(['Accuracy= ' num2str(x)]);
change it to:
% disp(['Accuracy= ' num2str(x)]);
If you are using the main libsvm library then you need to modify it before making. 1- Open the file 'svmpredict.c'
2- find this line of code:
info("Accuracy = %g%% (%d/%d) (classification)\n",
(double)correct/total*100,correct,total);
3- just comment it out using // operator
4- save and close the file
5- make the project