[fusl] Don't syscall(SYS_unlink) in stdio

fusl/src/stdio/tmpfile.c

Index: fusl/src/stdio/tmpfile.c
diff --git a/fusl/src/stdio/tmpfile.c b/fusl/src/stdio/tmpfile.c
index a9a608b5231e4d66830f7479d01471e70cd217b8..2f463a9804c6ffeac54b1c384eaaf72742932737 100644
--- a/fusl/src/stdio/tmpfile.c
+++ b/fusl/src/stdio/tmpfile.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <fcntl.h>
+#include <unistd.h>
 #include "stdio_impl.h"
 
 #define MAXTRIES 100
@@ -16,11 +17,7 @@ FILE* tmpfile(void) {
     __randname(s + 13);
     fd = sys_open(s, O_RDWR | O_CREAT | O_EXCL, 0600);
     if (fd >= 0) {
-#ifdef SYS_unlink
-      __syscall(SYS_unlink, s);
-#else
-      __syscall(SYS_unlinkat, AT_FDCWD, s, 0);
-#endif
+      unlink(s);
       f = __fdopen(fd, "w+");
       if (!f)
         __syscall(SYS_close, fd);