Prefix global_symbols with `ruby_`

.gdbinit

@@ -1073,9 +1073,9 @@ define print_id
   else
     set $serial = (rb_id_serial_t)$id
   end
-  if $serial && $serial <= global_symbols.last_id
+  if $serial && $serial <= ruby_global_symbols.last_id
     set $idx = $serial / ID_ENTRY_UNIT
-    set $ids = (struct RArray *)global_symbols.ids
+    set $ids = (struct RArray *)ruby_global_symbols.ids
     set $flags = $ids->basic.flags
     if ($flags & RUBY_FL_USER1)
       set $idsptr = $ids->as.ary

gc.c

@@ -8080,7 +8080,8 @@ gc_ref_update(void *vstart, void *vend, size_t stride, void * data)
     return 0;
 }
 
-extern rb_symbols_t global_symbols;
+extern rb_symbols_t ruby_global_symbols;
+#define global_symbols ruby_global_symbols
 
 static void
 gc_update_references(rb_objspace_t * objspace)

symbol.c

@@ -63,7 +63,8 @@ enum id_entry_type {
     ID_ENTRY_SIZE
 };
 
-rb_symbols_t global_symbols = {tNEXT_ID-1};
+rb_symbols_t ruby_global_symbols = {tNEXT_ID-1};
+#define global_symbols ruby_global_symbols
 
 static const struct st_hash_type symhash = {
     rb_str_hash_cmp,