ucx: graph

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fixes build on FreeBSD feature/array
Wed, 07 Aug 2019 21:44:35 +0200, by Olaf Wintermann
fixes #ifdefs to be sure no redefine can ever happen feature/array
Wed, 07 Aug 2019 21:20:08 +0200, by Mike Becker
ucx_array_sort() uses qsort_r(), if available feature/array
Wed, 07 Aug 2019 21:14:58 +0200, by Mike Becker