bench: refactor to use dynamic memory allocation in math/strided/special/strunc

PR-URL: #9481
Ref: #8643
Ref: #369
Co-authored-by: Athan Reines <kgryte@gmail.com>
Reviewed-by: Athan Reines <kgryte@gmail.com> 
Reviewed-by: Muhammad Haris <harriskhan047@outlook.com>

Author: kshitijgarg2811-oss

lib/node_modules/@stdlib/math/strided/special/strunc/benchmark/c/benchmark.length.c

@@ -114,11 +114,13 @@ float rand_uniformf( float a, float b ) {
 */
 static double benchmark( int iterations, int len ) {
 	double elapsed;
-	float x[ len ];
-	float y[ len ];
+	float *x;
+	float *y;
 	double t;
 	int i;
 
+	x = (float *)malloc( len * sizeof( float ) );
+	y = (float *)malloc( len * sizeof( float ) );
 	for ( i = 0; i < len; i++ ) {
 		x[ i ] = rand_uniformf( -10.0f, 10.0f );
 		y[ i ] = 0.0f;
@@ -135,6 +137,8 @@ static double benchmark( int iterations, int len ) {
 	if ( y[ 0 ] != y[ 0 ] ) {
 		printf( "should not return NaN\n" );
 	}
+	free( x );
+	free( y );
 	return elapsed;
 }