Fix bug, without 'exec' we need explicit exit.

Use 'exec' in `configure`.

Author: nascheme

Tools/configure/configure.awk

@@ -2,6 +2,7 @@
 # Generated by transpile.py -- do not edit.
 # This is a POSIX shell wrapper around an embedded AWK program.
 # Run: /bin/sh configure [options]
+set -eu
 
 # _find_awk — pick a working AWK that is not gawk.
 # gawk 5.2.x (Ubuntu 24.04) has a crash bug ("double free or corruption")
@@ -31,6 +32,7 @@ _tmpf=$(mktemp "${TMPDIR:-/tmp}/configure.XXXXXXXXXX") || exit 1
 trap 'rm -f "$_tmpf"' EXIT
 sed '1,/^#---AWK-START---$/d' "$0" > "$_tmpf"
 "$_awk" -f "$_tmpf" -- "$@"
+exit $?
 #---AWK-START---
 # === pyconf.awk runtime ===
 # pyconf.awk — AWK runtime library for the configure transpiler.

Tools/configure/transpiler/transpile.py

@@ -34,6 +34,7 @@
 # Generated by transpile.py -- do not edit.
 # This is a POSIX shell wrapper around an embedded AWK program.
 # Run: /bin/sh configure [options]
+set -eu
 
 # _find_awk — pick a working AWK that is not gawk.
 # gawk 5.2.x (Ubuntu 24.04) has a crash bug ("double free or corruption")
@@ -63,6 +64,7 @@
 trap 'rm -f "$_tmpf"' EXIT
 sed '1,/^#---AWK-START---$/d' "$0" > "$_tmpf"
 "$_awk" -f "$_tmpf" -- "$@"
+exit $?
 #---AWK-START---
 """