MT#57417 'WebRtcSpl_NormU32' is static but used in inline function 'log2_Q10_B'

This is a fix for the following warning:

     entropy_coding.c:101:11: warning: 'WebRtcSpl_NormU32' is static but used in inline function 'log2_Q10_B' which is not static
       101 |   zeros = WebRtcSpl_NormU32( x );
           |           ^~~~~~~~~~~~~~~~~
     entropy_coding.c:92:10: warning: 'kRPointsQ10' is static but used in inline function 'stepwise' which is not static
        92 |   return kRPointsQ10[ind];
           |          ^~~~~~~~~~~

This happens because the inline function has inside it a call
to the static function.

To fix the warning, we just make the `log2_Q10_B()` and `stepwise()` functions
static. It's quite safe, since they are not even in use by anything.

Change-Id: Id6588d85c7d347d5669d6495188e798fe7c70b05

core/plug-in/isac/libisac/entropy_coding.c

@@ -75,7 +75,7 @@ static const WebRtc_Word32 lbcnQ10 = -402874;
 #define MINBITS_Q10    10240  /* 10.0 in Q10 */
 #define IS_SWB_12KHZ       1
 
-__inline WebRtc_UWord32 stepwise(WebRtc_Word32 dinQ10) {
+static __inline WebRtc_UWord32 stepwise(WebRtc_Word32 dinQ10) {
 
   WebRtc_Word32 ind, diQ10, dtQ10;
 
@@ -92,8 +92,7 @@ __inline WebRtc_UWord32 stepwise(WebRtc_Word32 dinQ10) {
   return kRPointsQ10[ind];
 }
 
-
-__inline short log2_Q10_B( int x )
+static __inline short log2_Q10_B( int x )
 {
   int zeros;
   short frac;
@@ -103,8 +102,6 @@ __inline short log2_Q10_B( int x )
   return (short) (((31 - zeros) << 10) + frac);
 }
 
-
-
 /* compute correlation from power spectrum */
 static void WebRtcIsac_FindCorrelation(WebRtc_Word32 *PSpecQ12, WebRtc_Word32 *CorrQ7)
 {