Fix file/directory permissions after unpacking

[dnzbk]

Description

• fixed file/directory permissions overriden by the unpacker;
• added the DEBUG definition for debug builds on POSIX systems.

Testing

@dnzbk Linux Debian 12 with NZBGet v23.1
@phnzb Ubuntu 22.04.4 LTS x86_64

[Anuskuss]

This gives me F666 and D777 instead of the normal F644 and D755. If the user doesn't use the UMask setting you should ideally either read the user's umask or just assume 022 (for security purposes). And you should probably always request 777 and let the umask do the rest.

[luckedea]

@Anuskuss Thanks for the report, confirmed. Created an issue - #228 working on it.