Documented how to satisfy the OpenSSL dependency on Arch

Author: catalin-hritcu

ucontrib/CoreCrypto/INSTALL.md

@@ -55,8 +55,9 @@ opam install sqlite3
 
 * On recent Ubuntus and Debians, installing `openssl-dev` should be enough and work out of the box. (JP: OpenSSL 1.0.2d 9 Jul 2015 worked for me).
 * On older Ubuntus, we've had success with some PPA that offers a recent OpenSSL. See the `.travis.yml` file in the repo.
+* On Arch first run git clone https://github.com/openssl/openssl.git in `pub/ucontrib/CoreCrypto/ml` and then run `make` here as usual.
 
-Otherwise, if you get errors about missing `EVP_AES_GCM`, then you need to obtain the OpenSSL sourcecode, e.g. using
+Otherwise, if you get errors about missing `EVP_AES_GCM`, then you need to obtain the OpenSSL source code, e.g. using
 
     git clone https://github.com/openssl/openssl.git