* scripts/mesar.in: Remove bashisms.
* scripts/mesar.in: Rename from ar.in. Update users. * build-aux/build.sh.in (LIBS): Update. * build-aux/check.sh.in (recheck): Likwise. * build-aux/install.sh.in (DESTDIR): Likwise. * configure (main): Likwise. * configure.sh (mes_system): Likwise. * .gitignore: Update.