Tools/mmaps_generator: Fixed loading db2 stores on linux

* Author @rapsys

Closes #21898

# Conflicts:
#	src/tools/mmaps_generator/PathCommon.h

src/tools/mmaps_generator/PathCommon.h

@@ -25,6 +25,7 @@
 
 #ifndef _WIN32
     #include <stddef.h>
+    #include <cstring>
     #include <dirent.h>
 #endif
 
@@ -109,7 +110,7 @@ namespace MMAP
             errno = 0;
             if ((dp = readdir(dirp)) != nullptr)
             {
-                if (matchWildcardFilter(filter.c_str(), dp->d_name))
+                if (strcmp(dp->d_name, ".") != 0 && strcmp(dp->d_name, "..") != 0 && matchWildcardFilter(filter.c_str(), dp->d_name))
                     fileList.push_back(std::string(dp->d_name));
             }
             else