Remove printscan-long-double requirement

test/benchmark/mandelbrot/README.md

@@ -14,7 +14,7 @@ TODO
 
 ```sh
 wasicc -O3 -s mandel_dd.c -o mandel_dd.wasm
-wasicc -O3 -s mandel.c -o mandel.wasm -Wl,-lc-printscan-long-double
+wasicc -O3 -s mandel.c -o mandel.wasm
 ```
 
 ### Running

test/benchmark/mandelbrot/mandel.c

@@ -21,7 +21,7 @@ int main(int argc, char **argv) {
     } else if (argc == 3) {
         width = atoi(argv[1]);
         height = width;
-        magn = strtold(argv[2], NULL);
+        magn = strtod(argv[2], NULL);
     } else {
         fprintf(stderr, "usage: %s <size> <magnification>\n", argv[0]);
         return 1;