sandbox: Fix setjmp/longjmp

In sandbox, longjmp returns to itself in an endless loop because
os_longjmp() calls into longjmp() which is provided by U-Boot which
again calls os_longjmp().

Setjmp on the other hand must not return because otherwise the
return freees up stack elements that we need during longjmp().

The only straight forward fix that doesn't involve nasty hacks I
could find is to directly link against the system setjmp/longjmp
implementations. That means we just provide the compiler with
hints that the symbol will be available and actually fill them
out with versions from libc.

This approach should be reasonably platform agnostic

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

include/os.h

@@ -330,27 +330,6 @@ int os_spl_to_uboot(const char *fname);
  */
 void os_localtime(struct rtc_time *rt);
 
-/**
- * os_setjmp() - Call setjmp()
- *
- * Call the host system's setjmp() function.
- *
- * @jmp: Buffer to store current execution state
- * @size: Size of buffer
- * @return normal setjmp() value if OK, -ENOSPC if @size is too small
- */
-int os_setjmp(ulong *jmp, int size);
-
-/**
- * os_longjmp() - Call longjmp()
- *
- * Call the host system's longjmp() function.
- *
- * @jmp: Buffer where previous execution state was stored
- * @ret: Value to pass to longjmp()
- */
-void os_longjmp(ulong *jmp, int ret);
-
 /**
  * os_abort() - Raise SIGABRT to exit sandbox (e.g. to debugger)
  */