Fix gstack issues

With commit fb2ded33c1, I added
Fedora's gstack script to gdb.  Some issues have arisen since
then, and this patch addresses those issues:

. As Sam James recently noted[1], PKGVERSION and VERSION
  need to be quoted.
. A Fedora user reported the misuse of --readnever, which
  causes gstack to omit filename and line number information in the
  backtrace[Red Hat BZ 2354997].

[1] https://inbox.sourceware.org/gdb-patches/d19d6bc17e0a160ce27fc572079f11a587c0e168.1742424869.git.sam@gentoo.org/
Bug: https://bugzilla.redhat.com/show_bug.cgi?id=2354997

gdb/gstack-1.in

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright (C) 2024 Free Software Foundation, Inc.
+# Copyright (C) 2024-2025 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
@@ -22,8 +22,8 @@
 GDB=${GDB:-$(command -v gdb)}
 GDBARGS=${GDBARGS:-}
 AWK=${AWK:-}
-PKGVERSION=@PKGVERSION@
-VERSION=@VERSION@
+PKGVERSION="@PKGVERSION@"
+VERSION="@VERSION@"
 
 # Find an appropriate awk interpreter if one was not specified
 # via the environment.
@@ -132,7 +132,7 @@ EOF
 	  )
 
 # Run GDB and remove some unwanted noise.
-"$GDB" --quiet -nx --readnever $GDBARGS <<EOF |
+"$GDB" --quiet -nx $GDBARGS <<EOF |
 set width 0
 set height 0
 set pagination no

gdb/testsuite/gdb.base/gstack.exp

@@ -1,4 +1,4 @@
-# Copyright (C) 2024 Free Software Foundation, Inc.
+# Copyright (C) 2024-2025 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
@@ -62,8 +62,10 @@ if { ![gdb_assert { ![expr {$res < 0 || $res == ""}] } $test] } {
 set test "got backtrace"
 set saw_backtrace false
 set no_awk false
+set location_re ${srcfile}:${decimal}
+
 gdb_expect {
-    -i "$res" -re "#0 +(0x\[0-9a-f\]+ in )?main \(\).*\r\nGSTACK-END\r\n\$" {
+    -i "$res" -re "#0 +(0x\[0-9a-f\]+ in )?main \(\).*$location_re.*\r\nGSTACK-END\r\n\$" {
 	set saw_backtrace true
 	pass $test
 	exp_continue