fix: fixes C implementation for

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Author: DhruvArvindSingh

lib/node_modules/@stdlib/math/base/special/riemann-zeta/src/main.c

@@ -574,26 +574,6 @@ static double series( const double s ) {
 	return sum / ( TWO_N * stdlib_base_powm1( 2.0, 1.0 - s ) );
 }
 
-/**
-* Evaluates the Riemann zeta function for an odd positive integer.
-*
-* @param s    input value
-* @return     function value
-*
-* @example
-* double out = zeta( 3.0 );
-* // returns ~1.202
-*/
-static double zeta( const double s ) {
-	int32_t idx;
-
-	idx = ( s - 3 ) / 2;
-	if ( idx >= 56 ) {
-		return series( s );
-	}
-	return ODD_POSITIVE_INTEGERS[ idx ];
-}
-
 /**
 * Evaluates the Riemann zeta function.
 *