Move noise function declations to tr_common.h

tr_noise.c is in renderercommon directory, so declare them in header there too.

code/renderergl2/tr_local.h

@@ -2105,9 +2105,6 @@ extern cvar_t	*r_marksOnTriangleMeshes;
 
 //====================================================================
 
-float R_NoiseGet4f( float x, float y, float z, float t );
-void  R_NoiseInit( void );
-
 void R_SwapBuffers( int );
 
 void R_RenderView( viewParms_t *parms );