Add a "fork" of musl as //fusl.

fusl/src/stdlib/bsearch.c

+#include <stdlib.h>
+
+void *bsearch(const void *key, const void *base, size_t nel, size_t width, int (*cmp)(const void *, const void *))
+{
+        void *try;
+        int sign;
+        while (nel > 0) {
+                try = (char *)base + width*(nel/2);
+                sign = cmp(key, try);
+                if (!sign) return try;
+                else if (nel == 1) break;
+                else if (sign < 0)
+                        nel /= 2;
+                else {
+                        base = try;
+                        nel -= nel/2;
+                }
+        }
+        return NULL;
+}