[PATCH] malloc_conf_init: revert errno value when readlink(2) fail.

[Alex]

Hi,

In malloc_conf_init(), readlink(2) is called in order to read 
"/etc/malloc.conf". When readlink(2) fail (which is a common case, for 
exemple when "/etc/malloc.conf" does not exists) errno is set. This can 
lead to unexpected behaviour of malloc(), in my case malloc() set 
errno=2 (ENOENT) because "/etc/malloc.conf" does not exist (see test.c 
attached).

I wrote a patch that fixed the issue (against the dev branch). At first 
I didn't catch the !_WIN32 condition, so review is welcome (I could not 
test it under Windows). Also I thought it might be better to save & 
restore errno in malloc_init(), because it could catch other function 
call modifying errno. Does this make sens ?

Patch attached :)

Regards,
Alex.
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