I have fixed it with:
paul@jacko:~/gpc1/gcc-3.4.6/gcc$ diff -u ../../gpc-master/p/doc/hr/gpc.texi p/doc/hr/gpc.texi
--- ../../gpc-master/p/doc/hr/gpc.texi 2017-01-06 17:56:28.000000000 -0500
+++ p/doc/hr/gpc.texi 2021-03-06 07:33:22.993693828 -0500
@@ -1,9 +1,9 @@
\input texinfo
+@documentencoding iso-8859-2
@setfilename gpc-hr.info
@settitle GNU Pascal priru�nik.
@c We use Latin 2 charset for hr_HR language.
@set charset iso-8859-2
-@documentencoding iso-8859-2
@c Copyright (C) 1996-2006 Free Software Foundation, Inc.
@c This file is part of the GPC Manual.
paul@jacko:~/gpc1/gcc-3.4.6/gcc$
paul@jacko:~/gpc1/gcc-3.4.6/gcc$ diff -u ../../gpc-master/p/doc/es/gpcs.texi p/doc/es/gpcs.texi
--- ../../gpc-master/p/doc/es/gpcs.texi 2017-01-06 17:56:28.000000000 -0500
+++ p/doc/es/gpcs.texi 2021-03-06 07:58:40.895455259 -0500
@@ -1,7 +1,7 @@
\input texinfo
@setfilename gpcs.info
-@settitle Est�ndar de Codificaci�n GNU Pascal
@documentencoding iso-8859-1
+@settitle Est�ndar de Codificaci�n GNU Pascal
@c Copyright (C) 2001-2006 Free Software Foundation, Inc.
@c
paul@jacko:~/gpc1/gcc-3.4.6/gcc$