Fix trans_gain OpenMP to build with clang
Fix trans_gain OpenMP to build with clang

Use the new wrappers to protect clang from OpenMP and fix the build

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