mobile/example/audio: fix the broken Android build
mobile/example/audio: fix the broken Android build

Fixes golang/go#10758

Change-Id: I6e2084a817789fcadbe61e257446ed5a17b77a1d
Reviewed-on: https://go-review.googlesource.com/9878
Reviewed-by: David Crawshaw <a2f0bf29257797dd66800b4fbb9945c3e216c004@golang.org>

ppamorim/mobile,b54898533/mobile,qskycolor/mobile,lonphy23t/mobile,DanielWorld/mobile,0x90sled/mobile,swisspol/mobile,goldcaddy77/mobile,goldcaddy77/mobile,steeve/mobile,cainiaocome/mobile,steeve/mobile,b54898533/mobile,ppamorim/mobile,lonphy23t/mobile,xing/gomobile,MaxCy330/mobile,cainiaocome/mobile,0x90sled/mobile,zach-klippenstein/mobile,zach-klippenstein/mobile,0x90sled/mobile,goldcaddy77/mobile,ppamorim/mobile,swisspol/mobile,xing/gomobile,cainiaocome/mobile,zach-klippenstein/mobile,steeve/mobile,ppamorim/mobile,golang/mobile,golang/mobile,qskycolor/mobile,ichu501/mobile,freeman0211/mobile,freeman0211/mobile,MaxCy330/mobile,xing/gomobile,b54898533/mobile,goldcaddy77/mobile,qskycolor/mobile,tempbottle/mobile,cainiaocome/mobile,golang/mobile,steeve/mobile,swisspol/mobile,samanalysis/mobile,tempbottle/mobile,swisspol/mobile,0x90sled/mobile,ichu501/mobile,freeman0211/mobile,DanielWorld/mobile,golang/mobile,zach-klippenstein/mobile,MaxCy330/mobile,ichu501/mobile,MaxCy330/mobile,samanalysis/mobile,samanalysis/mobile,tempbottle/mobile,samanalysis/mobile,xing/gomobile,DanielWorld/mobile,samanalysis/mobile,lonphy23t/mobile,b54898533/mobile,b54898533/mobile,ppamorim/mobile,0x90sled/mobile,goldcaddy77/mobile,tempbottle/mobile,ichu501/mobile,xing/gomobile,freeman0211/mobile,MaxCy330/mobile,cainiaocome/mobile,DanielWorld/mobile,ichu501/mobile,lonphy23t/mobile,lonphy23t/mobile,swisspol/mobile,qskycolor/mobile,tempbottle/mobile