bench: update benchmark to use dynamic memory allocation

Signed-off-by: Nakul Krishnakumar <nakulkrishnakumar86@gmail.com>

Author: nakul-krishnakumar

lib/node_modules/@stdlib/math/base/special/fast/acoshf/benchmark/c/native/benchmark.c

@@ -92,12 +92,13 @@ static float random_uniform( const float min, const float max ) {
 * @return elapsed time in seconds
 */
 static double benchmark( void ) {
-	float x[ 100 ];
+	float *x;
 	double elapsed;
 	double t;
 	float y;
 	int i;
 
+	x = (float *) malloc( len * sizeof( float ) );
 	for ( i = 0; i < 100; i++ ) {
 		x[ i ] = random_uniform( 0.0f, 100.0f );
 	}
@@ -114,6 +115,7 @@ static double benchmark( void ) {
 	if ( y != y ) {
 		printf( "should not return NaN\n" );
 	}
+	free( x );
 	return elapsed;
 }