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de70fa53 - build: Simplify bison detection.

build: Simplify bison detection. * autogen.sh (GNULIB_MODULES_RUNTIME_OTHER): Add bison. * gettext-runtime/configure.ac: Don't invoke AC_PROG_YACC. * gettext-runtime/m4/intl.m4 (gt_INTL_SUBDIR_CORE): Invoke gl_PROG_BISON.