Specify slot for libgcrypt

now that emul-linux-x86-* is not requred when using abi_x86_32, it revealed that steamwebhelper is linked against libgcrypt.so.11. As long as we have at least one libgcrypt.so version, the rest of the occurances should be sane.
Merge pull request #120 from Tele42/patch-3

Specify slot for libgcrypt