Use full-read instead of safe-read

This helps handle archiving on certain filesystems where read()
returns less bytes than requested when reading from a regular
file.

References:

  https://savannah.gnu.org/bugs/index.php?64426
  https://lists.gnu.org/archive/html/bug-tar/2021-07/msg00001.html

* gnulib.modules: Add full-read.
* src/common.h: Include full-read.h
* src/misc.c: Use full_read.
* src/sparse.c: Likewise.
* src/update.c: Likewise.

gnulib.modules

@@ -79,7 +79,7 @@ readlinkat
 renameat
 root-uid
 rpmatch
-safe-read
+full-read
 savedir
 selinux-at
 setenv