core: fix memory leak in glob()'s readdir() on WinRT/_WIN32_WCE

readdir() allocates a new buffer for dir->ent.d_name on every call
and overwrites the previous pointer without freeing it. Since
cv::glob() calls readdir() once per directory entry, every call
except the last leaks its allocation. Under _WIN32_WCE, DIR has no
destructor at all, so every allocation leaks, including the last
one.

modules/core/src/glob.cpp

@@ -66,7 +66,7 @@ namespace
 #endif
         HANDLE handle;
         dirent ent;
-#ifdef WINRT
+#if defined(WINRT) || defined(_WIN32_WCE)
         DIR() { }
         ~DIR()
         {
@@ -113,6 +113,7 @@ namespace
         char* aname = new char[asize+1];
         aname[asize] = 0;
         wcstombs(aname, dir->data.cFileName, asize);
+        delete[] dir->ent.d_name;
         dir->ent.d_name = aname;
 #else
         if (dir->ent.d_name != 0)