Removal of OpenSSL dependancy in salt generation.
Removal of OpenSSL dependancy in salt generation.

Fixes DomBlack/php-scrypt#12 (Revert 398beb2)

PatidarWeb/php-scrypt,PatidarWeb/php-scrypt,danemacmillan/php-scrypt,PatidarWeb/php-scrypt,danemacmillan/php-scrypt,danemacmillan/php-scrypt