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

fusl/src/math/exp10f.c

+#define _GNU_SOURCE
+#include <math.h>
+#include <stdint.h>
+#include "libc.h"
+
+float exp10f(float x)
+{
+        static const float p10[] = {
+                1e-7f, 1e-6f, 1e-5f, 1e-4f, 1e-3f, 1e-2f, 1e-1f,
+                1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7
+        };
+        float n, y = modff(x, &n);
+        union {float f; uint32_t i;} u = {n};
+        /* fabsf(n) < 8 without raising invalid on nan */
+        if ((u.i>>23 & 0xff) < 0x7f+3) {
+                if (!y) return p10[(int)n+7];
+                y = exp2f(3.32192809488736234787031942948939f * y);
+                return y * p10[(int)n+7];
+        }
+        return exp2(3.32192809488736234787031942948939 * x);
+}
+
+weak_alias(exp10f, pow10f);