ODR warning for struct field_info

This renames one of the instance of "struct field_info" to avoid an
ODR warning.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=22395



diff --git a/gdb/rs6000-aix-tdep.c b/gdb/rs6000-aix-tdep.c
index ead03bf..867f21d 100644
--- a/gdb/rs6000-aix-tdep.c
+++ b/gdb/rs6000-aix-tdep.c
@@ -849,7 +849,7 @@ rs6000_aix_osabi_sniffer (bfd *abfd)
 /* A structure encoding the offset and size of a field within
    a struct.  */
 
-struct field_info
+struct ldinfo_field
 {
   int offset;
   int size;
@@ -861,13 +861,13 @@ struct field_info
 
 struct ld_info_desc
 {
-  struct field_info ldinfo_next;
-  struct field_info ldinfo_fd;
-  struct field_info ldinfo_textorg;
-  struct field_info ldinfo_textsize;
-  struct field_info ldinfo_dataorg;
-  struct field_info ldinfo_datasize;
-  struct field_info ldinfo_filename;
+  struct ldinfo_field ldinfo_next;
+  struct ldinfo_field ldinfo_fd;
+  struct ldinfo_field ldinfo_textorg;
+  struct ldinfo_field ldinfo_textsize;
+  struct ldinfo_field ldinfo_dataorg;
+  struct ldinfo_field ldinfo_datasize;
+  struct ldinfo_field ldinfo_filename;
 };
 
 /* The following data has been generated by compiling and running