Prevent warnings while building and executing

- ldd(1) checks whatever we have -x permissions to given library
- libraries may be referred by several ways, ex.:
    /usr/local/gcc-4.4.7/lib/../lib64/libstdc++.so.6 -> /usr/local/gcc-4.4.7/lib/../lib64/libstdc++.so.6.0.13
    /usr/local/gcc-4.4.7/lib64/libstdc++.so.6 -> /usr/local/gcc-4.4.7/lib/../lib64/libstdc++.so.6.0.13
  Allow this, but create symlink with `--force' option