[fpc-pascal] A patched unit overriding the default - like Delphi supports

[Felipe Monteiro de Carvalho]

The solution that I use is to rename the unit slightly, like I am
improving OpenSSL.pas, so I renamed it to MyOpenSSL.pas to avoid
conflicts. Once the changes are merged and released I will rename my
uses clauses back to OpenSSL.

Can be very annoying if the problem involves lot's of units, but for
simple cases works fine.

-- 
Felipe Monteiro de Carvalho