hello_pi: Fix rebuild script for hello_fft
hello_pi: Fix rebuild script for hello_fft

oniongarlic/userland,salih/userland,fredericofs/userland,kraj/userland,d3faultdotxbe/raspivid-accurate-fps-via-hacky-framedropping,6by9/userland,maroviher/userland,raspberrypi/userland,raspberrypi/userland,erlerobot/rpi-userland,DexterInd/userland,maroviher/userland,StealthMicro/userland,fredericofs/userland,adamheinrich/userland,maroviher/userland,erlerobot/rpi-userland,StealthMicro/userland,d3faultdotxbe/raspivid-accurate-fps-via-hacky-framedropping,yzhahn/userland,roberttidey/userland,hyunkim9123/userland,maxnet/userland,adamheinrich/userland,gonzoua/userland,gonzoua/userland,kraj/userland,JamesH65/userland,roberttidey/userland,salih/userland,luked99/userland-1,ethanol100/userland,hyunkim9123/userland,d3faultdotxbe/raspivid-accurate-fps-via-hacky-framedropping,6by9/userland,erlerobot/rpi-userland,maxnet/userland,FIIT-TNL/userland,ethanol100/userland,popcornmix/userland,oniongarlic/userland,raspberrypi/userland,adamheinrich/userland,hyunkim9123/userland,JamesH65/userland,DexterInd/userland,oniongarlic/userland,FIIT-TNL/userland,kraj/userland,fredericofs/userland,yzhahn/userland,StealthMicro/userland,popcornmix/userland,DexterInd/userland,luked99/userland-1,popcornmix/userland,6by9/userland,gonzoua/userland,roberttidey/userland,JamesH65/userland,luked99/userland-1,salih/userland,FIIT-TNL/userland,yzhahn/userland,maxnet/userland,d3faultdotxbe/raspivid-accurate-fps-via-hacky-framedropping,ethanol100/userland