fix newlib detection
fix newlib detection

jacksonh/sox,Distrotech/sox,Distrotech/sox,jacksonh/sox,uklauer/sox,cbagwell/sox,MageSlayer/sox,MageSlayer/sox,CaptainHayashi/sox,Motiejus/sox,cbagwell/sox,Motiejus/sox,Motiejus/sox,MageSlayer/sox,uklauer/sox,mhartzel/sox_personal_fork,davel/sox,jacksonh/sox,CaptainHayashi/sox,uklauer/sox,pcqpcq/sox,davel/sox,pcqpcq/sox,mhartzel/sox_personal_fork,davel/sox,Distrotech/sox,CaptainHayashi/sox,Distrotech/sox,jacksonh/sox,MageSlayer/sox,CaptainHayashi/sox,pcqpcq/sox,mhartzel/sox_personal_fork,pcqpcq/sox,Motiejus/sox,uklauer/sox,cbagwell/sox,cbagwell/sox,davel/sox,MageSlayer/sox,mhartzel/sox_personal_fork