#1662 Put back librt dependency
I tried to remove it as WITH_AIO
was now put in compilation of libmeshb, but it doesn't solve the issue and it is better to keep the explicit dependency to librt for Linux.
I tried to remove it as WITH_AIO
was now put in compilation of libmeshb, but it doesn't solve the issue and it is better to keep the explicit dependency to librt for Linux.