If _DL_FINI_CRT_COMPAT is defined, _dl_fini is setup to run at exit via
atexit(), but this makes it run _before_ the fini (__app_fini()) of the
app, causing stuff like sandbox that frees structs, etc via its fini to
segfault.

Relevant back-trace:

(gdb) bt
#0  0x400cb62c in free () from /lib/libc.so.0
#1  0x4000b3da in before_syscall (func=0x4000bd63 "unlink", file=0x80dca90 "/tmp/groff35k2OB") at libsandbox.c:1362
#2  0x40009c28 in unlink (pathname=0x80dca90 "/tmp/groff35k2OB") at libsandbox.c:657
#3  0x0805e34c in xtmpfile_list_init::~xtmpfile_list_init ()
#4  0x0805e557 in __static_initialization_and_destruction_0 ()
#5  0x0805e5a8 in global destructors keyed to tmpfile_prefix ()
#6  0x080494d6 in __do_global_dtors_aux ()
#7  0x0805e5fc in _fini ()
#8  0x400c91ba in exit () from /lib/libc.so.0
#9  0x400a1f7d in __uClibc_start_main () from /lib/libc.so.0
#10 0x080494a8 in _start ()
#11 0x00000003 in ?? ()
#12 0xbffff744 in ?? ()
#13 0xbffff754 in ?? ()
#14 0x08048ff8 in ?? ()
#15 0x0805e5e8 in __do_global_ctors_aux ()
#16 0x00000000 in ?? ()

--- uClibc-0.9.28/libc/misc/internals/__uClibc_main.c	2005-09-06 20:15:11 +0000
+++ uClibc-0.9.28.az/libc/misc/internals/__uClibc_main.c	2005-09-06 20:48:16 +0000
@@ -160,6 +160,16 @@
 
 void attribute_hidden (*__rtld_fini)(void) = NULL;
 
+#ifdef _DL_FINI_CRT_COMPAT
+void attribute_hidden (*__dl_fini)(void) = NULL;
+
+void _set__dl_fini(void *fini_func)
+{
+	if (fini_func != NULL)
+		__dl_fini = fini_func;
+}
+#endif
+
 /* __uClibc_start_main is the new main stub for uClibc. This function is
  * called from crt0 (version 0.9.16 or newer), after ALL shared libraries
  * are initialized, just before we call the application's main function.
--- uClibc-0.9.28/ldso/ldso/ldso.c	2005-09-06 20:12:30 +0000
+++ uClibc-0.9.28.az/ldso/ldso/ldso.c	2005-09-06 20:57:28 +0000
@@ -766,11 +766,13 @@
 #ifdef _DL_FINI_CRT_COMPAT
 	/* arches that have moved their ldso FINI handling should skip this part */
 	{
-		int (*_dl_atexit) (void *) = (int (*)(void *)) (intptr_t) _dl_find_hash("atexit",
+		void (*__set__dl_fini) (void *) = (void (*)(void *)) (intptr_t) _dl_find_hash("_set__dl_fini",
 				_dl_symbol_tables, NULL, ELF_RTYPE_CLASS_PLT);
 
-		if (_dl_atexit)
-			(*_dl_atexit) (_dl_fini);
+		if (__set__dl_fini)
+			(__set__dl_fini)(_dl_fini);
+		else
+			_dl_if_debug_dprint("_set__dl_fini not found\n");
 	}
 #endif
 
--- uClibc-0.9.28/libc/stdlib/atexit.c	2005-09-06 19:57:44 +0000
+++ uClibc-0.9.28.az/libc/stdlib/atexit.c	2005-09-06 20:45:22 +0000
@@ -223,6 +222,11 @@
 #endif
 
 extern void (*__rtld_fini)(void);
+
+#ifdef _DL_FINI_CRT_COMPAT
+extern void (*__dl_fini)(void);
+#endif
+
 /*
  * Normal program termination
  */
@@ -242,6 +246,9 @@
 #ifndef _DL_FINI_CRT_COMPAT
 	if (__rtld_fini != NULL)
 		(__rtld_fini)();
+#else
+	if (__dl_fini != NULL)
+		(__dl_fini)();
 #endif
 
     /* If we are using stdio, try to shut it down.  At the very least,