Only use execvpe on linux, execvp elsewhere (fixes #3759)
Only use execvpe on linux, execvp elsewhere (fixes #3759)

endragor/Nim,endragor/Nim,jfhg/Nim,jsanjuas/Nim,singularperturbation/Nim,jsanjuas/Nim,jsanjuas/Nim,singularperturbation/Nim,haiodo/Nim,haiodo/Nim,tulayang/Nim,haiodo/Nim,singularperturbation/Nim,mbaulch/Nim,singularperturbation/Nim,endragor/Nim,zachaysan/Nim,russpowers/Nim,singularperturbation/Nim,dom96/Nim,mbaulch/Nim,tulayang/Nim,mbaulch/Nim,russpowers/Nim,endragor/Nim,zachaysan/Nim,haiodo/Nim,jsanjuas/Nim,dom96/Nim,endragor/Nim,haiodo/Nim,mbaulch/Nim,russpowers/Nim,jsanjuas/Nim,zachaysan/Nim,zachaysan/Nim,dom96/Nim,mbaulch/Nim,endragor/Nim,dom96/Nim,jfhg/Nim,dom96/Nim,zachaysan/Nim,russpowers/Nim,tulayang/Nim,jsanjuas/Nim,endragor/Nim,singularperturbation/Nim,singularperturbation/Nim,jfhg/Nim,russpowers/Nim,haiodo/Nim,dom96/Nim,tulayang/Nim,jfhg/Nim,zachaysan/Nim,dom96/Nim,jfhg/Nim,haiodo/Nim,russpowers/Nim,jfhg/Nim,zachaysan/Nim,tulayang/Nim,jsanjuas/Nim,mbaulch/Nim,jfhg/Nim,russpowers/Nim,mbaulch/Nim,tulayang/Nim