Give all anonymously typedeffed structs in headers a name

Anonymous structs cannot be forward declared and have no benefit.

libavcodec/amrnbdata.h

@@ -55,7 +55,7 @@ enum Mode {
 /**
  * AMRNB unpacked data subframe
  */
-typedef struct {
+typedef struct AMRNBSubframe {
     uint16_t p_lag;      ///< index to decode the pitch lag
     uint16_t p_gain;     ///< index to decode the pitch gain
     uint16_t fixed_gain; ///< index to decode the fixed gain factor, for MODE_12k2 and MODE_7k95
@@ -65,7 +65,7 @@ typedef struct {
 /**
  * AMRNB unpacked data frame
  */
-typedef struct {
+typedef struct AMRNBFrame {
     uint16_t lsf[5];           ///< lsf parameters: 5 parameters for MODE_12k2, only 3 for other modes
     AMRNBSubframe subframe[4]; ///< unpacked data for each subframe
 } AMRNBFrame;