[PATCH 8/9] posix: Use enum for __glob_pattern_type result

[Paul Eggert]

Adhemerval Zanella wrote:
> My understanding was double underscore identifiers are reserved for implementation
> (C99 7.1.3 Reserved identifiers).

Yes, and that's the point. When this code is used as part of Gnulib, it is used 
within an application, so any identifiers it uses that start with __ might 
collide with the implementation, which means it's safer to avoid them when it's 
easy, as is the case here.