The module signing script (sign-file) used to be a wrapper around the
openssl program.  It has now been replaced by a C program that uses the
crypto library from the OpenSSL package meaning that the OpenSSL devel
packages are necessary to provide the devel library link and the header
files.

This would be openssl-devel on Fedora and libssl-dev on Debian.
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NJames Morris <james.l.morris@oracle.com>