maint: remove obsolete AC_PROG_GCC_TRADITIONAL

* configure.ac: Remove obsolete macro call.
Recent autoconf warns that it is obsolete.
AC_PROG_CPP sets up the -traditional-cpp option if required.
GCC ignores -traditional since commit f458d1d5 (2002).
Fixes https://bugs.gnu.org/67756

diff --git a/configure.ac b/configure.ac
index eec1107906a4cb441f832a33d5765d94956999b6..de57b32167c7cc6a5f1474f1a4e06f08375d8d53 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -55,7 +55,6 @@ gl_ASSERT_NO_GNULIB_POSIXCHECK])
 AC_PROG_CC
 AM_PROG_CC_C_O
 AC_PROG_CPP
-AC_PROG_GCC_TRADITIONAL
 AC_PROG_RANLIB
 AC_PROG_EGREP
 AC_PROG_LN_S