Add utime function to posix.cfg

cfg/posix.cfg

@@ -1,5 +1,16 @@
 <?xml version="1.0"?>
 <def format="1">
+  <function name="utime">
+    <noreturn>false</noreturn>
+    <arg nr="1">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+    </arg>
+    <leak-ignore/>
+  </function>
   <function name="usleep">
     <noreturn>false</noreturn>
     <arg nr="1">

test/cfg/posix.c

@@ -46,6 +46,8 @@ void nullPointer(char *p) {
     getcwd (0, 0);
     // cppcheck-suppress nullPointer
     readdir (0);
+    // cppcheck-suppress nullPointer
+    utime(NULL, NULL);
 }
 
 void memleak_getaddrinfo() {