shadow uses obsolete SELinux API

[bigon]

Hello,

It seems that the shadow source package is using obsolete SELinux API,
for example:

In file included from passwd.c:46:
/usr/include/selinux/flask.h:5:2: warning: #warning "Please remove any #include's of this header in your source code." [-Wcpp]
 #warning "Please remove any #include's of this header in your source code."
  ^~~~~~~
/usr/include/selinux/flask.h:6:2: warning: #warning "Instead, use string_to_security_class() to map the class name to a value." [-Wcpp]
 #warning "Instead, use string_to_security_class() to map the class name to a value."
  ^~~~~~~
In file included from passwd.c:47:
/usr/include/selinux/av_permissions.h:1:2: warning: #warning "Please remove any #include of this header in your source code." [-Wcpp]
 #warning "Please remove any #include of this header in your source code."
  ^~~~~~~
/usr/include/selinux/av_permissions.h:2:2: warning: #warning "Instead, use string_to_av_perm() to map the permission name to a value." [-Wcpp]
 #warning "Instead, use string_to_av_perm() to map the permission name to a value."

That should be fixed as it could lead to security issues (or at least
weakened security) for people using SELinux

Kind regards,

Laurent Bigonville