K 10
svn:author
V 8
dumbbell
K 8
svn:date
V 27
2018-01-28T12:34:39.101391Z
K 7
svn:log
V 495
graphics/darktable: Include `stddef.h` when testing zError() symbol

The `CheckZlib.cmake` module uses `NULL` in the test source code to
check for the `zError()` symbol. This fails to build on FreeBSD 10.3
with the following error:

    CheckPrototypeDefinition.c:15:10: error: use of undeclared identifier 'NULL'
      return NULL;
             ^

I don't know the root cause for this failure, but including `stddef.h`
in this test source code fixes the problem.

PR:		225501
Reported by:	cpm@

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