Add rule for rename

Author: lucic71

rules/stdio/src.cpp

@@ -56,3 +56,7 @@ int f19(FILE *stream, off_t offset, int whence) {
 }
 
 FILE *f20(int fd, const char *mode) { return fdopen(fd, mode); }
+
+int f22(const char *a0, const char *a1) {
+  return rename(a0, a1);
+}

rules/stdio/tgt_unsafe.rs

@@ -85,3 +85,7 @@ unsafe fn f19(a0: *mut ::libc::FILE, a1: i64, a2: i32) -> i32 {
 unsafe fn f20(a0: i32, a1: *const u8) -> *mut ::libc::FILE {
     libc::fdopen(a0, a1 as *const i8)
 }
+
+unsafe fn f22(a0: *const i8, a1: *const i8) -> i32 {
+    libc::rename(a0 as *const i8, a1 as *const i8)
+}