Version 2.4_rc1 (2.4-1)
Use strict_strtoul instead of kstrtoul on old kernel

Redhat has strict_strtoul in the whitelist api, not kstrtoul.
Even if strict_strtoul is now deprecated, it is the same
Extract (pp?|e?[ug)id in order to share code later
Add support for recent kernels (user namespaces)