update to posh-0.3.9

patch provided by pancake at phreaker.net in PR 26777

changes (from Debian changelog):
posh (0.3.9) unstable; urgency=medium
  * trap builtin now errors when no signals are specified.
    closes: #265103.
  * Move trap-related regression tests to their own file,
    and add one to check for error on "trap 0".

posh (0.3.8) unstable; urgency=high
  * Fix tilde expansion thinko introduced in 0.3.4.

posh (0.3.7) unstable; urgency=low
  * Remove some cruft left around from ksh functions.

posh (0.3.6) unstable; urgency=low
  * Add a better regression test for umask.
  * Drop support of ksh88 ":[#%]+"-type trimming.
  * Adjust regression tests to make sure ${blah:#blah} gives
    an error.

posh (0.3.5) unstable; urgency=low
  * Clean unused variables left after 0.3.4.
  * Add prebuild target to debian/rules.
  * Drop qsort altogether.

posh (0.3.4) unstable; urgency=low
  * Fix most of the signedness comparison warnings.
  * Remove homedir caching code.
  * Switch specials, keywords, aliases, builtins, vars, and funs hashes
    to use libc tsearch() and friends.
  * Remove old table hash routines.

posh (0.3.3) unstable; urgency=low
  * Rename custom table functions to prevent conflicts with
    b-tree functions when search.h is included.
  * Remove vestigial tracked alias code.

posh (0.3.2) unstable; urgency=low
  * Make getn() use strtol().
  * Mark unused function parameters to avoid gcc warnings.

posh (0.3.1) unstable; urgency=low
  * Use libc's instead of internal qsort.
  * Add -W to CFLAGS.

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