gnulib-tool, and autoreconf.
* lib/appendstr.c: New file, from man-db.
* lib/debug.c: Likewise.
* m4/pipeline-gcc-warning.m4: Likewise.
* m4/pipeline-socketpair.m4: Likewise.
* lib/pipeline-private.h: New file.
* lib/pipeline.c (command_new_argstr): Use strcmp rather than STREQ.
  (pipeline_install_post_fork): New function.
  (pipeline_start): Call post-fork handler rather than hardcoding
  pop_all_cleanups.
* lib/pipeline.h (pipeline_install_post_fork): Add prototype.
* lib/pipeline.c: Update copyright notice for libpipeline.
* lib/pipeline.h: Likewise.
* gnulib: Import dirname, error, gettext, lib-ignore, setenv,
  sigaction, signal, sigprocmask, strerror, strsignal, sys_select,
  xalloc, xstrndup, and xvasprintf modules.
* Makefile.am: New file.
* NEWS: New file.
* autogen.sh: New file.
* configure.ac: New file.
* lib/Makefile.am: New file.
* .bzrignore: New file.