gnu: Use invoke and return #t from all builders.

* gnu/packages/admin.scm, gnu/packages/android.scm, gnu/packages/audio.scm,
gnu/packages/avr.scm, gnu/packages/base.scm, gnu/packages/bioinformatics.scm,
gnu/packages/certs.scm, gnu/packages/check.scm, gnu/packages/code.scm,
gnu/packages/commencement.scm, gnu/packages/dictionaries.scm,
gnu/packages/docbook.scm, gnu/packages/emacs.scm, gnu/packages/embedded.scm,
gnu/packages/fonts.scm, gnu/packages/games.scm, gnu/packages/gnome.scm,
gnu/packages/gnu-doc.scm, gnu/packages/guile.scm, gnu/packages/hurd.scm,
gnu/packages/javascript.scm, gnu/packages/libreoffice.scm,
gnu/packages/linux.scm, gnu/packages/lisp.scm, gnu/packages/lxde.scm,
gnu/packages/mail.scm, gnu/packages/markup.scm, gnu/packages/mate.scm,
gnu/packages/pkg-config.scm, gnu/packages/qt.scm, gnu/packages/rust.scm,
gnu/packages/scheme.scm, gnu/packages/sdl.scm, gnu/packages/statistics.scm,
gnu/packages/syncthing.scm, gnu/packages/tex.scm, gnu/packages/web.scm,
gnu/packages/wine.scm, gnu/packages/xfce.scm: In the builders of packages
using 'trivial-build-system', use invoke where appropriate, raise exceptions
on errors, and otherwise return #t.

1 files changed, 1 insertions, 1 deletions

diff --git a/gnu/packages/mail.scm b/gnu/packages/mail.scm
index 9a72a00a58..7769ebf05a 100644
--- a/gnu/packages/mail.scm
+++ b/gnu/packages/mail.scm
@@ -1808,7 +1808,7 @@ in Perl.")
            (mkdir-p bin)
            (with-directory-excursion bin
              (copy-file source "mb2md.gz")
-             (system* (string-append gzip "/bin/gzip") "-d" "mb2md.gz")
+             (invoke (string-append gzip "/bin/gzip") "-d" "mb2md.gz")
              (substitute* "mb2md"
                (("#!/usr/bin/perl")
                 (string-append "#!/usr/bin/perl -I " perl5lib)))