tmux configure doesn't find yacc on Linux

["Sijmen J. Mulder" <ik%sjmulder.nl@localhost>]

Hi all,

On (at least) Debian 12, Ubuntu 24.04 and CentOS 7 building misc/tmux
fails during configure:

  ...
  checking event2/event.h usability... yes
  checking event2/event.h presence... yes
  checking for event2/event.h... yes
  checking for yacc... no
  configure: error: "yacc not found"
  *** Error code 1

I tried adding yacc to USE_TOOLS, but same issue.

Checking .tools/bin/yacc, it symlinks to /bin/yacc
-> /etc/alternatives/yacc -> /usr/bin/bison.yacc which is a shell
script invoking bison -y. Invoking yacc directly in the shell also
works.

Perhap this rings a bell for someone, otherwise I'll have a closer look
later.

Sijmen