Replace MUTEX_INITIALIZER with _LIBC_LOCK_INITIALIZER in generic code

[Florian Weimer]

On 08/20/2016 04:48 PM, Samuel Thibault wrote:
> +	* malloc/malloc.c (main_arena): Use MUTEX_INITIALIZER instead of
> +	_LIBC_LOCK_INITIALIZER.

No, you need to define _LIBC_LOCK_INITIALIZER in terms of 
MUTEX_INITIALIZER.  If this is not possible, you need to select a lock 
which is compatible with the libc_lock infrastructure for the malloc mutex.

Florian