Upgrade lib/fnmatch.[ch] to the latest from glibc-2.1.2 because the

FNM_PATHNAME flag (to stop at slashes in path names) was not working.

Ironically, the bug in glibc's fnmatch was reported on the rsync mailing
list in late October, and rsync's configure.in was changed to detect the
bad glibc and use the internal fnmatch, but the internal fnmatch was based
on the same buggy glibc!