tests: move tests to a directory per utility

* cfg.mk: Adjust syntax check exclusion paths.
* tests/local.mk: Adjust for renamed tests.

tests/printf/printf-hex.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+# make sure that only two hex. digits are consumed in a \xHHH sequence
+
+# Copyright (C) 2002-2023 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ printf
+
+env printf '\x7e3\n' > out || fail=1
+cat <<\EOF > exp
+~3
+EOF
+
+compare exp out || fail=1
+
+Exit $fail