mpy-cross: Use binary file translation mode for creating mpy files on windows

This is a fix for https://github.com/micropython/micropython/issues/2209:
by default a file created using open() uses text translation mode so writing
\n to it will result in the file having \r\n. This is obviously problematic
for binary .mpy files, so provide functions for setting the open mode
and use binary mode in mpy-cross' main().

mpy-cross/main.c

@@ -35,6 +35,9 @@
 #include "py/runtime.h"
 #include "py/gc.h"
 #include "py/stackctrl.h"
+#ifdef _WIN32
+#include "windows/fmode.h"
+#endif
 
 // Command line options, with their defaults
 STATIC uint emit_opt = MP_EMIT_OPT_NONE;
@@ -185,6 +188,9 @@ MP_NOINLINE int main_(int argc, char **argv) {
     gc_init(heap, heap + heap_size);
 
     mp_init();
+#ifdef _WIN32
+    set_fmode_binary();
+#endif
     mp_obj_list_init(mp_sys_path, 0);
     mp_obj_list_init(mp_sys_argv, 0);