Ruby

Applied in changeset trunk|r60110.

file.c: release GVL around lstat(2)

Like stat(2), lstat(2) can be expensive on slow filesystems and
should not block other threads. There should be a minor, but
not significant slowdowns in single-threaded performance similar
to benchmarks around the more-portable stat(2):
[ruby-core:83012] [Bug #13941]

• file.c (no_gvl_lstat): new function for rb_thread_call_without_gvl
  (lstat_without_gvl): new wrapper to replace lstat(2) calls
  (rb_file_s_lstat): s/lstat/&_without_gvl/
  (rb_file_lstat): ditto
  (rb_file_symlink_p): ditto
  (rb_file_s_ftype): ditto
  (rb_file_expand_path_internal): ditto
  (realpath_rec): ditto
  [ruby-core:83075] [Feature #13963]