- Fixed and enabled multithreded processing
  https://bugzilla.audacityteam.org/show_bug.cgi?id=2492

- Regenerate man page with md2man 1.0-alt2 which produces better result

- Fix git merge mistake
- Add simple test to prevent such mistakes in /etc/sysconfig/btrfsmaintenance
  in the future

- Fix debuginfo which did not contain source code
- Build with system CFLAGS

- Version 2.4:
  + Report error if PulseAudio default source and/or sink have not been found
  + LANG=c was not a valid value, set LANG=POSIX instead (LANG=C would also be valid)
  + In addition to LANG=POSIX, set LC_ALL=POSIX to ensure that English output of pactl
    is being grepped (RB#10163)