FIXED: absolute_file_name/3 to enumerate all solutions while loading a file

If a file is being loaded, '$chk_file'/5 searches relative to the directory
of the file being loaded.  This search was guarded by an if-then-else to
implement the deprecated fallback to the working directory, killing the
choice points of the file candidates.  As a result, solutions(all) only
produced the first candidate.  Now uses a soft cut.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: JanWielemaker

boot/init.pl

@@ -1429,7 +1429,7 @@
     !,
     (   file_directory_name(ContextFile, Dir),
         '$chk_file_relative_to'(File, Exts, Cond, Dir, FullName)
-    ->  true
+    *-> true
     ;   current_prolog_flag(source_search_working_directory, true),
 	'$extend_file'(File, Exts, Extended),
 	'$file_conditions'(Cond, Extended),