fixes build on FreeBSD feature/array

fixes #ifdefs to be sure no redefine can ever happen feature/array

ucx_array_sort() uses qsort_r(), if available feature/array

reverts deletion of tests for ucx_array_at() feature/array

(0) -300 -100 -30 -10 -4 +4 +10 +30 +100 +300 tip

mercurial