Bug#1032221: cryptsetup: libgcc_s.so.1 must be installed for pthread_exit to work

[Bastian Germann]

Control: notfound -1 cryptsetup/2:2.6.1-1

This is not an issue in testing because the argon2/cryptsetup combination is 
okay there.
The migration excuses did not catch the grave bugs' changes in time for the 
migration to happen.
I do not think that the changes justify an unblock request, so I am not going 
to file one.