posix.cfg: Added support for fnmatch.

cfg/posix.cfg

@@ -2741,6 +2741,24 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
       <not-null/>
     </arg>
   </function>
+  <!-- http://man7.org/linux/man-pages/man3/fnmatch.3.html -->
+  <!-- int fnmatch(const char *pattern, const char *string, int flags); -->
+  <function name="fnmatch">
+    <use-retval/>
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1">
+      <not-uninit/>
+      <not-null/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+      <not-null/>
+    </arg>
+    <arg nr="3">
+      <not-uninit/>
+    </arg>
+  </function>
   <memory>
     <alloc init="true">strdup</alloc>
     <alloc init="true">strndup</alloc>