Fixed files encoding

Fixed files encoding

Forwarded: Yes
Bug: https://gitlab.com/freepascal.org/fpc/source/-/issues/41130
Last-Update: 2025-02-02

Some files are distributed by upstream in national encoding. This patch
converts them to unicode.

The convertion was doen using the follwong commands:
recode latin1..UTF-8 fpcsrc/packages/fcl-base/examples/testreg.pp
recode latin1..UTF-8 fpcsrc/rtl/os2/tests/pmdemo1.h
recode latin1..UTF-8 demo/os2/pmdemo1.h

The two last files requiered additional manual fix.

Gbp-Pq: Name Fixed-files-encoding.patch