samba4 configure test for broken readdir has bug.

[John E. Malmberg]

The file samba4/source/build/tests/os2_delete.c is defining a macro that 
includes the __FUNCTION__ built in even though that built in may not be 
available.

As a result, the compile fails and readdir is marked as broken even if 
is not broken.

At this point in the configure script, configure has already determined 
if the __FUNCTION__ built in exists or not.

-John
wb8tyw at qsl.net
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