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

[Paul Eggert]

Adhemerval Zanella wrote:
> +enum glob_pattern_type_t
> +{
> +  __GLOB_NONE      = 0x0,
> +  __GLOB_SPECIAL   = 0x1,
> +  __GLOB_BACKSLASH = 0x2,
> +  __GLOB_BRACKET   = 0x4
> +};

The identifier glob_pattern_type_t is not used elsewhere, so let's omit it. This 
makes it clearer that we're merely defining handy names for int constants, as 
opposed to defining a new type.

Also, names like __GLOB_NONE could cause problems when Gnulib is used on non-GNU 
platforms, which might use those names for other purposes. As glob_internal.h is 
not user-visible, let's use ordinary names. I suggest GLOBPAT_NONE, 
GLOBPAT_SPECIAL, etc., as done in the attached patch, which I installed into Gnulib.
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