TST: fix test failures in trimmed statistics tests with numpy master.
TST: fix test failures in trimmed statistics tests with numpy master.

Closes gh-7598

arokem/scipy,apbard/scipy,grlee77/scipy,WarrenWeckesser/scipy,person142/scipy,mdhaber/scipy,perimosocordiae/scipy,scipy/scipy,aeklant/scipy,matthew-brett/scipy,gfyoung/scipy,lhilt/scipy,Eric89GXL/scipy,arokem/scipy,scipy/scipy,vigna/scipy,vigna/scipy,zerothi/scipy,vigna/scipy,grlee77/scipy,ilayn/scipy,nmayorov/scipy,perimosocordiae/scipy,Eric89GXL/scipy,apbard/scipy,jor-/scipy,andyfaff/scipy,gertingold/scipy,jor-/scipy,Stefan-Endres/scipy,endolith/scipy,tylerjereddy/scipy,nmayorov/scipy,mdhaber/scipy,anntzer/scipy,andyfaff/scipy,nmayorov/scipy,zerothi/scipy,e-q/scipy,aeklant/scipy,arokem/scipy,ilayn/scipy,e-q/scipy,anntzer/scipy,aarchiba/scipy,perimosocordiae/scipy,grlee77/scipy,zerothi/scipy,aarchiba/scipy,WarrenWeckesser/scipy,nmayorov/scipy,endolith/scipy,nmayorov/scipy,ilayn/scipy,jamestwebber/scipy,pizzathief/scipy,andyfaff/scipy,anntzer/scipy,scipy/scipy,apbard/scipy,endolith/scipy,zerothi/scipy,jor-/scipy,WarrenWeckesser/scipy,mdhaber/scipy,rgommers/scipy,aeklant/scipy,ilayn/scipy,jamestwebber/scipy,matthew-brett/scipy,tylerjereddy/scipy,andyfaff/scipy,anntzer/scipy,WarrenWeckesser/scipy,Eric89GXL/scipy,aarchiba/scipy,Eric89GXL/scipy,rgommers/scipy,Stefan-Endres/scipy,pizzathief/scipy,vigna/scipy,grlee77/scipy,jamestwebber/scipy,person142/scipy,rgommers/scipy,Stefan-Endres/scipy,apbard/scipy,rgommers/scipy,gfyoung/scipy,WarrenWeckesser/scipy,tylerjereddy/scipy,jamestwebber/scipy,matthew-brett/scipy,perimosocordiae/scipy,gfyoung/scipy,lhilt/scipy,mdhaber/scipy,andyfaff/scipy,matthew-brett/scipy,jamestwebber/scipy,endolith/scipy,Eric89GXL/scipy,endolith/scipy,pizzathief/scipy,scipy/scipy,e-q/scipy,WarrenWeckesser/scipy,grlee77/scipy,person142/scipy,endolith/scipy,aarchiba/scipy,scipy/scipy,zerothi/scipy,ilayn/scipy,gfyoung/scipy,gertingold/scipy,jor-/scipy,person142/scipy,Stefan-Endres/scipy,lhilt/scipy,apbard/scipy,gertingold/scipy,zerothi/scipy,gertingold/scipy,rgommers/scipy,Eric89GXL/scipy,scipy/scipy,arokem/scipy,aeklant/scipy,lhilt/scipy,Stefan-Endres/scipy,tylerjereddy/scipy,e-q/scipy,Stefan-Endres/scipy,person142/scipy,vigna/scipy,anntzer/scipy,gertingold/scipy,anntzer/scipy,gfyoung/scipy,mdhaber/scipy,matthew-brett/scipy,perimosocordiae/scipy,aarchiba/scipy,pizzathief/scipy,arokem/scipy,jor-/scipy,perimosocordiae/scipy,lhilt/scipy,tylerjereddy/scipy,e-q/scipy,ilayn/scipy,pizzathief/scipy,aeklant/scipy,mdhaber/scipy,andyfaff/scipy