[fpc-pascal] libc error on older Linux

[Rainer Stratmann]

> I assume that you don't use this deprecated unit libc, do you? However,
> AFAIK, Lazarus adds a couple of units like cwstrings, cthreads, etc., to
> applications automatically, and these imply use of libc.so even without
> using unit libc. Unit cwstrings may be relevant for working with
> UnicodeStrings - does your application use UnicodeStrings / WideStrings?
> If not, you might be able to remove that dependency. If you use them,
> you might still try using unit fpwidestring instead.
> 
> Tomas

By now unit libc I can not find on the fly.

Units cwstrings, cthreads, UnicodeStrings, etc. I don't use.

Most things I write by myself, except the ssl library and the crypto library.

I have to test step by step what causes the issue.

The same huge (more than 100 units, mostly self written) Program in 32 Bit 
works perfect as I mentioned already.