[PATCH] glob: Simplify the interface for the GLOB_ALTDIRFUNC callback gl_readdir

[Florian Weimer]

Previously, application code had to set up d_ino and d_namlen members
if the platform supported them, involving conditional compilation.
The changes cause glob to ignore d_ino in GLOB_ALTDIRFUNC mode, and
always rely on the string length instead of using d_namlen.  DT_UNKNOWN
is zero, so zero-initialization of struct dirent will set the d_type
member to a conservative value.

Florian
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