Fix missing math library linking.
Fix missing math library linking.

ycho/daala,jmvalin/daala,KyleSiefring/daala,felipebetancur/daala,HeadhunterXamd/daala,KyleSiefring/daala,xiphmont/daala,tdaede/daala,jmvalin/daala,mbebenita/daala,jmvalin/daala,xiph/daala,vr000m/daala,kbara/daala,felipebetancur/daala,smarter/daala,nvoron23/daala,kodabb/daala,mbebenita/daala,tribouille/daala,tdaede/daala_awcy_runs,mbebenita/daala,nvoron23/daala,ycho/daala,kbara/daala,xiphmont/daala,jmvalin/daala,kustom666/daala,metajack/daala,ycho/daala,felipebetancur/daala,HeadhunterXamd/daala,ascent12/daala,tdaede/daala,smarter/daala,ycho/daala,luctrudeau/daala,tdaede/daala,nvoron23/daala,KyleSiefring/daala,ekr/daala,kodabb/daala,xiphmont/daala,kbara/daala,tdaede/daala_awcy_runs,iankronquist/daala,ekr/daala,xiph/daala,luctrudeau/daala,kodabb/daala,mbebenita/daala,vr000m/daala,ekr/daala,ascent12/daala,kodabb/daala,kustom666/daala,kustom666/daala,iankronquist/daala,felipebetancur/daala,smarter/daala,felipebetancur/daala,kustom666/daala,fluffy/daala,xiph/daala,tdaede/daala_awcy_runs,xiph/daala,fluffy/daala,kbara/daala,tribouille/daala,vr000m/daala,fluffy/daala,kodabb/daala,vr000m/daala,xiphmont/daala,nvoron23/daala,nvoron23/daala,tribouille/daala,iankronquist/daala,KyleSiefring/daala,luctrudeau/daala,HeadhunterXamd/daala,HeadhunterXamd/daala,tribouille/daala,tribouille/daala,metajack/daala,kustom666/daala,smarter/daala,mbebenita/daala,ascent12/daala,xiph/daala,ascent12/daala,tdaede/daala,tdaede/daala_awcy_runs,luctrudeau/daala,ycho/daala,iankronquist/daala,KyleSiefring/daala,metajack/daala,luctrudeau/daala,jmvalin/daala,xiphmont/daala,HeadhunterXamd/daala,iankronquist/daala,ascent12/daala,vr000m/daala