dir.c: release GVL around remaining readdir calls

Release GVL around all remaining readdir calls from the Dir
class to prevent pathological stalls on slow filesystems in
multi-threaded applications.

opendir, rewinddir, closedir calls are not affected yet, but
will be changed in future commits.

In the future, further work may be done consolidate multiple GVL
releasing calls to reduce overhead, similar to how changes to
Dir.empty? were made in r60111

* dir.c (nogvl_readdir): new function
  (readdir_without_gvl): ditto
  (dir_read): s/READDIR/readdir_without_gvl/
  (dir_each_entry): ditto
  (glob_helper): ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60769 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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