[Rpm-maint] [rpm-software-management/rpm] Add OpenSSL crypto backend (#129)

[Stephen Gallagher]

These patches add support for building RPM against OpenSSL 1.1.0 to provide hashing and signature functionality. It is enabled by passing `--with-openssl` to `configure`. (For backwards compatibility, it retains the use of `--with[out]-nss` as a toggle between beecrypt and nss).

I have tested these patches with the following scenarios:
* Sign a package using a 2048-bit RSA key with RPM compiled against OpenSSL and verify it with RPM compiled against OpenSSL.
* Sign a package using a 2048-bit RSA key with RPM compiled against OpenSSL and verify it with RPM compiled against NSS.
* Sign a package using a 1024-bit DSA key with RPM compiled against OpenSSL and verify it with RPM compiled against OpenSSL.
* Sign a package using a 1024-bit DSA key with RPM compiled against OpenSSL and verify it with RPM compiled against NSS.
* Sign a package using a 2048-bit RSA key with RPM compiled against NSS and verify it with RPM compiled against OpenSSL.
* Sign a package using a 1024-bit DSA key with RPM compiled against NSS and verify it with RPM compiled against OpenSSL.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/129

-- Commit Summary --

  * Add initial OpenSSL support
  * OpenSSL: Add support for RSA signatures
  * OpenSSL: Add support for DSA signatures

-- File Changes --

    M Makefile.am (17)
    M configure.ac (45)
    M rpmio/Makefile.am (6)
    A rpmio/digest_openssl.c (707)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/129.patch
https://github.com/rpm-software-management/rpm/pull/129.diff

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https://github.com/rpm-software-management/rpm/pull/129
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