opus: fix gcc2 build.
opus: fix gcc2 build.

moochris/haikuports,Begasus/haikuports,haikuports/haikuports,miqlas/haikuports,Begasus/haikuports,koletzky/haikuports,haikuports/haikuports,koletzky/haikuports,nielx/haikuports,nielx/haikuports,moochris/haikuports,moochris/haikuports,nielx/haikuports,haikuports/haikuports,Begasus/haikuports,haikuports/haikuports,koletzky/haikuports,Begasus/haikuports,haikuports/haikuports,Begasus/haikuports,miqlas/haikuports,miqlas/haikuports