some progress on dos vesa, but not quite

Common/Std/nolibc.c

@@ -48,7 +48,7 @@ void sincos(double v, double *s, double *c) {
 
 double sqrt(double v) {
   double r;
-  __asm__ volatile("sqrtss %1, %0" : "=x"(r) : "x"(v));
+  __asm__ volatile("rsqrtss %1, %0" : "=x"(r) : "x"(v));
   return r;
 }