Log Message:
quilt: update to 0.68.

Based on PR 59040 by db7.

Version 0.68 (Wed Mar 27 2024)
  - Add support for zstd archives
  - Documentation: Massive formatting update of the manual page
  - Documentation: Reword some sections of the manual page
  - Fix compatibility with BSD awk
  - Fix compatibility with GNU awk version 5.0.0 and later
  - Fix compatibility with GNU grep version 3.8 and later
  - Fix compatibility with Solaris ln (#63451)
  - Installation: Fix multiple issues in install-sh (#64430)
  - Test suite: Fix various race conditions (#63651)
  - patches: Find file name with a space in unapplied patches (#41708)
  - pop: Hint at diff -z on failure
  - setup: Document the limitation of spec file support

Version 0.67 (Tue Feb 15 2022)
  - Call pager with original LANG environment variable
  - Consistently complain early if no series file is found
  - Fix handling of symbolic links by several commands
  - Tighten the patch format parsing
  - Reuse the shell (performance)
  - Document the series file format further
  - Document that quilt loads /etc/quilt.quiltrc
  - configure: Make stat configurable
  - series: Minor optimizations
  - setup: Don't obey the settings of any englobing .pc
  - setup: Default to fast mode
  - quilt.el: Fix documentation of quilt-pc-directory
  - quilt.el: Load /etc/quilt.quiltrc if ~/.quiltrc doesn't exist
  - quilt.el: Fix quilt-editable when QUILT_PATCHES_PREFIX is set