BLD: Don't leave the build task running if runtests.py is interrupted
BLD: Don't leave the build task running if runtests.py is interrupted

Without this, my powershell terminal would block on the build completing.

This already matches the logic in the log-less case

grlee77/numpy,pbrod/numpy,seberg/numpy,pdebuyl/numpy,pizzathief/numpy,pizzathief/numpy,shoyer/numpy,jakirkham/numpy,jorisvandenbossche/numpy,numpy/numpy,rgommers/numpy,anntzer/numpy,pdebuyl/numpy,WarrenWeckesser/numpy,endolith/numpy,charris/numpy,anntzer/numpy,anntzer/numpy,gfyoung/numpy,madphysicist/numpy,madphysicist/numpy,numpy/numpy,gfyoung/numpy,simongibbons/numpy,jakirkham/numpy,grlee77/numpy,simongibbons/numpy,shoyer/numpy,seberg/numpy,endolith/numpy,endolith/numpy,MSeifert04/numpy,pdebuyl/numpy,abalkin/numpy,mattip/numpy,jorisvandenbossche/numpy,charris/numpy,WarrenWeckesser/numpy,mattip/numpy,pizzathief/numpy,mhvk/numpy,abalkin/numpy,simongibbons/numpy,pdebuyl/numpy,seberg/numpy,pbrod/numpy,numpy/numpy,anntzer/numpy,ahaldane/numpy,gfyoung/numpy,endolith/numpy,MSeifert04/numpy,pizzathief/numpy,mattip/numpy,numpy/numpy,pbrod/numpy,shoyer/numpy,mhvk/numpy,madphysicist/numpy,jakirkham/numpy,pizzathief/numpy,shoyer/numpy,MSeifert04/numpy,rgommers/numpy,grlee77/numpy,pbrod/numpy,madphysicist/numpy,seberg/numpy,jakirkham/numpy,madphysicist/numpy,rgommers/numpy,WarrenWeckesser/numpy,ahaldane/numpy,mhvk/numpy,jorisvandenbossche/numpy,abalkin/numpy,jorisvandenbossche/numpy,ahaldane/numpy,MSeifert04/numpy,ahaldane/numpy,grlee77/numpy,charris/numpy,pbrod/numpy,mhvk/numpy,jakirkham/numpy,mattip/numpy,ahaldane/numpy,rgommers/numpy,mhvk/numpy,charris/numpy,WarrenWeckesser/numpy,WarrenWeckesser/numpy,simongibbons/numpy,grlee77/numpy,MSeifert04/numpy,shoyer/numpy,jorisvandenbossche/numpy,simongibbons/numpy