Log Message:
mksandbox: Update to version 1.10.

Change the /dev/shm handling on Linux to account for systemd being a complete
nightmare and changing mount types behind your back automatically.

The previous fixed works fine, until it magically changes from a tmpfs with
1777 permissions to a devtmpfs with 0755 permissions, with obvious failures
resulting when building as non-root.

Tested on el6 and el7, with the latter now reliably able to build Python.