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

fusl/src/math/hypotf.c

+#include <math.h>
+#include <stdint.h>
+
+float hypotf(float x, float y)
+{
+        union {float f; uint32_t i;} ux = {x}, uy = {y}, ut;
+        float_t z;
+
+        ux.i &= -1U>>1;
+        uy.i &= -1U>>1;
+        if (ux.i < uy.i) {
+                ut = ux;
+                ux = uy;
+                uy = ut;
+        }
+
+        x = ux.f;
+        y = uy.f;
+        if (uy.i == 0xff<<23)
+                return y;
+        if (ux.i >= 0xff<<23 || uy.i == 0 || ux.i - uy.i >= 25<<23)
+                return x + y;
+
+        z = 1;
+        if (ux.i >= (0x7f+60)<<23) {
+                z = 0x1p90f;
+                x *= 0x1p-90f;
+                y *= 0x1p-90f;
+        } else if (uy.i < (0x7f-60)<<23) {
+                z = 0x1p-90f;
+                x *= 0x1p90f;
+                y *= 0x1p90f;
+        }
+        return z*sqrtf((double)x*x + (double)y*y);
+}