Avoid a shell bug in Tru64 4.0 sh's handling of double-quoted strings.

Avoid a shell bug in Tru64 4.0 sh's handling of double-quoted strings.
[patch by Paul Eggert]

* tests/chmod/c-option: When double-quoting part of a word, prefer
to double-quote the whole word.  This is a bit easier to read (at
least for me), and in some cases it avoids a shell bug with Tru64
4.0 sh reported by Nelson H. F. Beebe.  For example, instead of
"$abs_srcdir"/../setgid-check we now write
"$abs_srcdir/../setgid-check".

* tests/cp/cp-parents: Likewise.
* tests/du/inaccessible-cwd: Likewise.
* tests/du/long-from-unreadable: Likewise.
* tests/install/basic-1: Likewise.
* tests/install/trap: Likewise.
* tests/misc/close-stdout: Likewise.
* tests/mkdir/concurrent-1: Likewise.
* tests/mkdir/p-1: Likewise.
* tests/mkdir/p-3: Likewise.
* tests/mkdir/parents: Likewise.
* tests/mkdir/perm: Likewise.
* tests/readlink/can-e: Likewise.
* tests/readlink/can-f: Likewise.
* tests/readlink/can-m: Likewise.
* tests/rm/inaccessible: Likewise.
* tests/rm/unread3: Likewise.
* tests/touch/no-create-missing: Likewise.

* lib/.cvsignore: Add uinttostr.c.