Update to Bash 4.2 patchlevel 42.

* If a backslash-newline (which is removed) with no other input is given as
  input to `read', the shell tries to dereference a null pointer and seg faults.

* Under certain circumstances, bash attempts to expand variables in
  arithmetic expressions even when evaluation is being suppressed.

* Output redirection applied to builtin commands missed I/O errors if
  they happened when the file descriptor was closed, rather than on write
  (e.g., like with an out-of-space error on a remote NFS file system).

* Process substitution incorrectly inherited a flag that inhibited using
  the (local) temporary environment for variable lookups if it was providing
  the filename to a redirection.  The intent the flag is to enforce the
  POSIX command expansion ordering rules.

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