Use local dir for io test tmp file on Windows.
int main (void) {
FILE *f;
+#ifndef _WIN32
const char *fname = "/tmp/__tmp.mirb";
+#else
+ const char *fname = "__tmp.mirb";
+#endif
MIR_context_t ctx = MIR_init ();
create_mir_func_sieve (ctx, NULL, NULL);
