ntfs-3g: needs libgcrypt

Now that we've moved to gnutls 3.x which no longer uses libgcrypt we
need to pull it in as a dependency for ntfs-3g encrypted volume support
to avoid build breakage.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>