10l: wrap float_interleave functions in HAVE_YASM.

fixes compilation with --disable-yasm

libavcodec/x86/fmtconvert_mmx.c

@@ -235,6 +235,7 @@ static void float_to_int16_interleave_3dn2(int16_t *dst, const float **src, long
         float_to_int16_interleave_3dnow(dst, src, len, channels);
 }
 
+#if HAVE_YASM
 void ff_float_interleave2_mmx(float *dst, const float **src, unsigned int len);
 void ff_float_interleave2_sse(float *dst, const float **src, unsigned int len);
 
@@ -262,13 +263,16 @@ static void float_interleave_sse(float *dst, const float **src,
     else
         ff_float_interleave_c(dst, src, len, channels);
 }
+#endif
 
 void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx)
 {
     int mm_flags = av_get_cpu_flags();
 
     if (mm_flags & AV_CPU_FLAG_MMX) {
+#if HAVE_YASM
         c->float_interleave = float_interleave_mmx;
+#endif
 
         if(mm_flags & AV_CPU_FLAG_3DNOW){
             if(!(avctx->flags & CODEC_FLAG_BITEXACT)){
@@ -285,7 +289,9 @@ void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx)
             c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_sse;
             c->float_to_int16 = float_to_int16_sse;
             c->float_to_int16_interleave = float_to_int16_interleave_sse;
+#if HAVE_YASM
             c->float_interleave = float_interleave_sse;
+#endif
         }
         if(mm_flags & AV_CPU_FLAG_SSE2){
             c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_sse2;