Modified openssl version to avoid bug in 1.0.1g version

There is a bug in openssl 1.0.1g version [1] that is fixed in 1.0.1h version.
Just update the openssl version fixes the problem. You can see the error in [2] and 
more info in [3].
@acasajus 


[1] https://github.com/openssl/openssl/issues/57
[2] http://askubuntu.com/questions/454575/error-255-when-trying-to-install-openssl-1-0-1g-from-source
[3] https://github.com/DIRACGrid/Externals/issues/5