You can try to use this script to launch your DAW rather than making all these crazy modifications
Code:
#!/bin/bash
FLD_PATH="`dirname "${0}"`"
export DYLD_INSERT_LIBRARIES="${FLD_PATH}/libstdc++.6.0.9.dylib"
"/Applications/Logic Pro X.app/Contents/MacOS/Logic Pro X"
1. Open TextEdit -> Format -> Make Plain Text
2. Paste the script and save it
3. Get Info on saved script and remove .txt from filename
4. Open Terminal and make script executable: chmod +x /path/to/script
5. Place modified libstdc++.6.0.9.dylib to the same folder
6. Double click on the script
Logic Pro X is just for instance.
Replace the path to binary with your DAW.