Update opus from 1.1 to 1.1.4

Define FLOAT_APPROX in Makefile and misc/msvc12/quake3.vcxproj.

code/opus-1.1/silk/structs.h

@@ -171,7 +171,7 @@ typedef struct {
     opus_int32                   pitchEstimationThreshold_Q16;      /* Threshold for pitch estimator                                    */
     opus_int                     LTPQuantLowComplexity;             /* Flag for low complexity LTP quantization                         */
     opus_int                     mu_LTP_Q9;                         /* Rate-distortion tradeoff in LTP quantization                     */
-    opus_int32                   sum_log_gain_Q7;					/* Cumulative max prediction gain									*/
+    opus_int32                   sum_log_gain_Q7;                   /* Cumulative max prediction gain                                   */
     opus_int                     NLSF_MSVQ_Survivors;               /* Number of survivors in NLSF MSVQ                                 */
     opus_int                     first_frame_after_reset;           /* Flag for deactivating NLSF interpolation, pitch prediction       */
     opus_int                     controlled_since_last_payload;     /* Flag for ensuring codec_control only runs once per packet        */