build: Use AC_MSG_ERROR instead of obsolete AC_ERROR

m4/dpkg-build.m4

@@ -40,6 +40,6 @@ AC_DEFUN([DPKG_WITH_DIR], [
 # Check if the condition is fulfilled when preparing a distribution tarball.
 AC_DEFUN([DPKG_DIST_CHECK], [
   AS_IF([test ! -f $srcdir/.dist-version && $1], [
-    AC_ERROR([not building from distributed tarball, $2])
+    AC_MSG_ERROR([not building from distributed tarball, $2])
   ])
 ])# DPKG_DIST_CHECK