Fix _csu_abort for i386-openbsd

rtl/openbsd/i386/si_c.inc

@@ -39,11 +39,11 @@ procedure _FPC_proc_start; assembler; nostackframe; public name '_start'; public
 
 function _strrchr(str: PAnsiChar; character: LongInt): PAnsiChar; forward;
 
-procedure _csu_abort; cdecl; external name '_csu_abort';
+procedure _csu_abort; cdecl; public name '_csu_abort';
 begin
   asm
     int3
- 	end;
+  end;
 end;
 
 procedure _FPC_proc___start(argc: LongInt; argv: PPAnsiChar; envp: Pointer; cleanup: TCdeclProcedure); cdecl;