1. POSIX defines well when GLOB_ABORTED can be returned (only for directory

open/read errors and with GLOB_ERR and gl_errfunc processing), so we can't
blindly return it on any MAXPATHLEN overflow. Even our manpage disagrees
with such GLOB_ABORTED usage. Use GLOB_NOSPACE for that now with errno is
set to 0 as for limits.

2. Return GLOB_NOSPACE when valid ~ expansion can't happens due to

MAXPATHLEN overflow too.

3. POSIX (and our manpage) says, if GLOB_ERR is set, GLOB_ABORTED should

be returned immediatelly, without using gl_errfunc. Implement it now.