revert commit fdfd175d46ac6a810ebdeb2a2936e6d7d13995ab
Remove mi_arena nested function.
m68k: Convert fork.c to arch-fork.h
Add mmap usage in malloc_info output

The current malloc_info xml output only has information about
allocations on the heap.  Display information about number of mappings
and total mmapped size to this to complete the picture.
Fix formatting in malloc_info
Replace __int128 with __int128_t

	* sysdeps/x86_64/link-defines.sym (BND_SIZE): Replace __int128
	with __int128_t.
aarch64: Fix error return from __ioctl

Forgotten in ca3cfa40c16ef34c74951a07a57cfcbcd58898b1
where the error branch was moved from PSEUDO_RET.
aarch64: Remove PSEUDO_RET