version compatibility baseline for Perl OpenSSL packages

 A subset of Perl XS module packages expose the OpenSSL binary interface
 to Perl code. This can lead to incompatibilities if these packages are
 linked against different versions of OpenSSL.
 .
 This package provides a virtual package "perl-openssl-abi-x" that
 corresponds to the libssl-dev package SONAME it was built against.
 The packages that need to stay compatible with each other can depend
 on this.
 .
 Tools are also provided for generating this dependency with minimum
 hassle. See the instructions in README.Debian.