New public function gpgrt_access.
* src/gpg-error.h.in (gpgrt_access): New. * src/gpg-error.vers. src/gpg-error.def.in: Add new function. * src/sysutils.c (any8bitchar): New. (_gpgrt_access): New. * src/visibility.c (gpgrt_access): New. * src/spawn-w32.c (_gpgrt_spawn_process_detached): Use it. * src/argparse.c (try_versioned_conffile): Use it. * tests/t-stringutils.c (check_access): New simple test.
This is basically a wrapper to allow handling of utf8 encoded file
names on Windows. This also fixes the case for versioned config files
in directories with non-ascii characters.
The new test needs to be run manually on Windows using a directory
with Unicode characters.
- GnuPG-bug-id: T5098