r23844: Add patch series from Volker (after review and consultation).

r23844: Add patch series from Volker (after review and consultation).

0001-Save-a-strdup-in-stat_cache_add.patch
0002-Use-ISDOT-and-ISDOTDOT.patch
0003-Move-fname_equal-around.patch
0004-unix_convert-pstring-dirpath-char.patch
0005-Ignore-.o-files.patch
0006-Get-rid-of-pstrings-inside-unix_convert.patch
0007-revert-pstring-unix_convert.patch
0008-Make-name-an-allocated-pstring-inside-unix_convert.patch
0009-Pass-explicit-pstring-to-mangle_check_cache.patch
0010-Don-t-overwrite-orig_path-unnecessarily.patch
0011-Defer-allocating-name.patch
0012-Make-sure-dirpath-is-always-correctly-allocated.patch
0013-Remove-one-pstring-dependency-in-unix_convert.patch
0014-Remove-more-name-pstring-dependencies.patch
0015-Hide-the-nasty-API-of-mangle_check_cache-in-mangle_c.patch
0016-name-does-not-need-to-be-pstring-size-anymore.patch
0017-Make-use-of-ISDOT-and-ISDOTDOT.patch
0018-Remove-pstring-from-stat_cache_lookup.patch
0019-Add-my-copyright.patch

To remove pstrings from statcache and unix_convert.

Jeremy.
(This used to be commit ea6ef368891af24164d2e76700c405a82b3dfc19)