fix configure message for multi-thread
fix configure message for multi-thread

it's not just decoding, but general multi-threading

Change-Id: I9d1b7e14f05b93a0eb92955526b7019c2b0df20c

webmproject/libwebp,rxl194/libwebp,gshORTON/webm.libwebp,ttyangf/libwebp,rxl194/libwebp,Suvarna1488/webm.libwebp,kleopatra999/webm.libwebp,rxl194/libwebp,Maria1099/webm.libwebp,ttyangf/libwebp,ericmckean/webm.libwebp,yohunl/libwebp,Acidburn0zzz/webm.libwebp,ttyangf/libwebp,Suvarna1488/webm.libwebp,zofuthan/libwebp,kim42083/webm.libwebp,gshORTON/webm.libwebp,kalli123/webm.libwebp,comoyo/gonzo-libwebp,reimaginemedia/webm.libwebp,jiehu5114/libwebp,iniwf/webm.libwebp,ttyangf/libwebp,iniwf/webm.libwebp,Aexyn/libwebp,Suvarna1488/webm.libwebp,PKRoma/libwebp,yohunl/libwebp,Acidburn0zzz/webm.libwebp,redengineer/libwebp,matanbs/webm.libwebp,abwiz0086/webm.libwebp,Acidburn0zzz/webm.libwebp,altogother/webm.libwebp,abwiz0086/webm.libwebp,Maria1099/webm.libwebp,abwiz0086/webm.libwebp,matanbs/webm.libwebp,webmproject/libwebp,zofuthan/libwebp,imazen/libwebp,gshORTON/webm.libwebp,ya7lelkom/libwebp,kalli123/webm.libwebp,kalli123/webm.libwebp,rxl194/libwebp,reimaginemedia/webm.libwebp,PKRoma/libwebp,matanbs/webm.libwebp,yohunl/libwebp,kim42083/webm.libwebp,kleopatra999/webm.libwebp,jacklicn/libwebp,appunite/libwebp,yohunl/libwebp,ericmckean/webm.libwebp,appunite/libwebp,Aexyn/libwebp,iniwf/webm.libwebp,redengineer/libwebp,reimaginemedia/webm.libwebp,iniwf/webm.libwebp,Acidburn0zzz/webm.libwebp,kim42083/webm.libwebp,jacklicn/libwebp,webmproject/libwebp,jiehu5114/libwebp,ya7lelkom/libwebp,Aexyn/libwebp,gshORTON/webm.libwebp,jiehu5114/libwebp,imazen/libwebp,comoyo/gonzo-libwebp,iniwf/webm.libwebp,jacklicn/libwebp,kim42083/webm.libwebp,matanbs/webm.libwebp,redengineer/libwebp,PKRoma/libwebp,PKRoma/libwebp,ya7lelkom/libwebp,comoyo/gonzo-libwebp,webmproject/libwebp,altogother/webm.libwebp,kleopatra999/webm.libwebp,webmproject/libwebp,zofuthan/libwebp,ttyangf/libwebp,ya7lelkom/libwebp,jacklicn/libwebp,jiehu5114/libwebp,abwiz0086/webm.libwebp,Suvarna1488/webm.libwebp,abwiz0086/webm.libwebp,imazen/libwebp,kalli123/webm.libwebp,appunite/libwebp,PKRoma/libwebp,Aexyn/libwebp,kleopatra999/webm.libwebp,imazen/libwebp,ya7lelkom/libwebp,yohunl/libwebp,ericmckean/webm.libwebp,imazen/libwebp,comoyo/gonzo-libwebp,rxl194/libwebp,redengineer/libwebp,Aexyn/libwebp,ericmckean/webm.libwebp,appunite/libwebp,comoyo/gonzo-libwebp,zofuthan/libwebp,redengineer/libwebp,comoyo/gonzo-libwebp,reimaginemedia/webm.libwebp,kleopatra999/webm.libwebp,Maria1099/webm.libwebp,Maria1099/webm.libwebp,ericmckean/webm.libwebp,matanbs/webm.libwebp,kim42083/webm.libwebp,comoyo/gonzo-libwebp,kalli123/webm.libwebp,appunite/libwebp,Acidburn0zzz/webm.libwebp,Maria1099/webm.libwebp,Suvarna1488/webm.libwebp,jacklicn/libwebp,jiehu5114/libwebp,zofuthan/libwebp,reimaginemedia/webm.libwebp,altogother/webm.libwebp,altogother/webm.libwebp,PKRoma/libwebp,gshORTON/webm.libwebp,appunite/libwebp,altogother/webm.libwebp