[patch] provide declaration for likely() and unlikely() in libcli/util/ntstatus.h (partial fix)

[Brad Hards]

Hi,

libcli/util/ntstatus.h uses likely() and unlikely() for a few macros, such as 
NT_STATUS_IS_OK() and NT_STATUS_IS_ERR(). My understanding of the relevant 
samba code is that likely() and unlikely() are provided by 
libreplace/replace.h

However for an external user of ntstatus.h (such as openchange), those 
definitions from libreplace are not available.

The easiest solution (for me) is to just add the definitions from libreplace 
into ntstatus.h. See attached patch. That is enough of a fix for openchange 
needs, and I appreciate the desire to get a samba4 alpha out.

However maybe this would be better as a separate header file, since there is 
another public user (ndr.h). I wasn't sure where to place such a header file in 
the samba tree, or where to install it.

Brad
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