chore: remove unused rand_double helper in stats/strided/dmaxabssorted

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---

Author: Om-A-osc

lib/node_modules/@stdlib/stats/strided/dmaxabssorted/benchmark/c/benchmark.length.c

@@ -77,15 +77,6 @@ static double tic( void ) {
 	return (double)now.tv_sec + (double)now.tv_usec/1.0e6;
 }
 
-/**
-* Generates a random number on the interval [0,1).
-*
-* @return random number
-*/
-static double rand_double( void ) {
-	int r = rand();
-	return (double)r / ( (double)RAND_MAX + 1.0 );
-}
 
 /**
 * Runs a benchmark.