curl tool: symbol check adjustment

src/tool_binmode.c

@@ -37,10 +37,12 @@
 
 void set_binmode(FILE *stream)
 {
-#ifdef __HIGHC__
+#ifdef O_BINARY
+#  ifdef __HIGHC__
   _setmode(stream, O_BINARY);
-#else
+#  else
   setmode(fileno(stream), O_BINARY);
+#  endif
 #endif
 }