Fix annoying build warning

hcore/include/senseApis/senseApiLib.h

@@ -64,12 +64,23 @@ public:
 
 class SenseApiLib
 {
+private:
+    friend class SenseApiManager;
+    struct DlCloser
+    {
+        void operator()(void* handle) const
+        {
+            if (handle) {
+                dlclose(handle);
+            }
+        }
+    };
+
 public:
     SenseApiLib(
         const std::string& path, void *_dlopen_handle, getSenseApiDescFn *descFn)
     :   libraryPath(path),
-        dlopen_handle(
-            _dlopen_handle, reinterpret_cast<void(*)(void*)>(&dlclose)),
+        dlopen_handle(_dlopen_handle, DlCloser()),
         HK_GET_SENSE_API_DESC_FN_NAME(descFn)
     {}
 
@@ -98,7 +109,7 @@ public:
 
 public:
     std::string libraryPath;
-    std::unique_ptr<void, void(*)(void*)> dlopen_handle;
+    std::unique_ptr<void, DlCloser> dlopen_handle;
     /* UNIMPLEMENTED: API-specific cmdline options. These affect this specific
      * sense api lib's behaviour globally.
      */