dist: generate POSIX.1-2001/pax tarball for UTF-8 portability

Refs NixOS/nixpkgs#107768

Author: scop

configure.ac

@@ -1,6 +1,9 @@
 AC_PREREQ([2.60])
 AC_INIT([bash-completion], [2.11])
-AM_INIT_AUTOMAKE([foreign dist-xz no-dist-gzip -Wall -Wno-portability -Werror])
+dnl tar-pax for portable UTF-8 handling
+AM_INIT_AUTOMAKE([
+    foreign dist-xz no-dist-gzip tar-pax -Wall -Wno-portability -Werror
+])
 AC_PROG_LN_S
 AC_PROG_MKDIR_P
 AC_PROG_SED