gnu: libbacktrace: Update to 1.0-2.cdb64b6.

* gnu/packages/debug.scm (libbacktrace): Update to 1.0-2.cdb64b6.
[arguments]: Disable parallel tests.

gnu/packages/debug.scm

@@ -12,6 +12,7 @@
 ;;; Copyright © 2022 Michael Rohleder <mike@rohleder.de>
 ;;; Copyright © 2022 Matthew James Kraai <kraai@ftbfs.org>
 ;;; Copyright © 2023 Andy Tai <atai@atai.org>
+;;; Copyright © 2023 Ricardo Wurmus <rekado@elephly.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -688,8 +689,8 @@ fun.")
 
 (define-public libbacktrace
   ;; There are no releases nor tags.
-  (let ((revision "1")
-        (commit "5009c113981431ae1843ebd29d6ad24eb32fc1b2"))
+  (let ((revision "2")
+        (commit "cdb64b688dda93bbbacbc2b1ccf50ce9329d4748"))
     (package
       (name "libbacktrace")
       (version (git-version "1.0" revision commit))
@@ -701,10 +702,11 @@ fun.")
                 (file-name (git-file-name name version))
                 (sha256
                  (base32
-                  "0663zjpfpnsyv9h3pbp7cgmg9gz79n68bqpdl97y6i0jsx93v1zg"))))
+                  "0iwd41pgr2nxlmghqdfwfwxac27jbqxwxp07jihhq85a8s3igjgr"))))
       (build-system gnu-build-system)
       (arguments
-       `(#:make-flags '("CFLAGS=-fPIC")))
+       `(#:parallel-tests? #f ;spurious failures when testing in parallel
+         #:make-flags '("CFLAGS=-fPIC")))
       (home-page "https://github.com/ianlancetaylor/libbacktrace")
       (synopsis "C library for producing symbolic backtraces")
       (description "The @code{libbacktrace} library can be linked into a C/C++