gnu: mu: Update to 1.10.2.

* gnu/packages/mail.scm (mu): Update to 1.10.2.
[arguments]: Add build phase 'fix-build-system.

Revert "gnu: opendht: Update to 2.5.2."

This reverts commit 31534f4e4dd95d65584b4334fae8b9444a369065.  It broke libjami.

gnu: opendht: Update to 2.5.2.

* gnu/packages/networking.scm (opendht): Update to 2.5.2.

gnu: restinio: Update to 0.6.18-0.eda471e and enable tests.

* gnu/packages/networking.scm (restinio): Update to 0.6.18-0.eda471e.
[version]: Use git-version.
[arguments]: Enable tests, removing #:tests? argument.

status: Guard against a numerical overflow condition.

Fixes <https://issues.guix.gnu.org/62766>.

* guix/status.scm (update-build): Use 0 as progress when an exception occurs
while computing it.

gnu: Syncthing: Update to 1.23.4.

* gnu/packages/syncthing.scm (syncthing): Update to 1.23.4.

gnu: libconfig: Replace config script helpers.

* gnu/packages/textutils.scm (libconfig)[arguments]: Add phase to
replace config.guess, config.sub.
[native-inputs]: Add config.

gnu: ldc: Use default test check.

* gnu/packages/dlang.scm (ldc)[arguments]: Strip the inherited tests
configuration from ldc-bootstrap rather than setting it to #true.

gnu: qpdf: Fix cross-building.

* gnu/packages/pdf.scm (qpdf)[arguments]: When cross-building add
configure-flags to set /dev/random and /dev/urandom as existing.

gnu: ijs: Fix cross-building to riscv64-linux.

* gnu/packages/ghostscript.scm (ijs)[arguments]: When building for
riscv64-linux replace config.guess and config.sub.
[native-inputs]: When building for riscv64-linux add config.

gnu: cups-minimal: Fix cross-building to riscv64-linux.

* gnu/packages/cups.scm (cups-minimal)[arguments]: When building for
riscv64-linux replace the config.guess and config.sub files.
[native-inputs]: When building for riscv64-linux add config.

doc: Regarding SSL certs, clarify when we write about Guix System.

Rationale: Even though the section 'X.509 Certificates' is part of the
System Configuration chapter, readers might also come here from a
cross-reference when reading about Application Setup on a foreign
distro.

* doc/guix.texi (System Configuration)[X.509 Certificates]: Clarify.

gnu: s6-linux-utils: Update to 2.6.1.2.

* gnu/packages/skarnet.scm (s6-linux-utils): Update to 2.6.1.2.

gnu: s6-linux-init: Update to 1.1.1.0.

* gnu/packages/skarnet.scm (s6-linux-init): Update to 1.1.1.0.

gnu: s6-portable-utils: Update to 2.3.0.2.

* gnu/packages/skarnet.scm (s6-portable-utils): Update to 2.3.0.2.

gnu: s6-rc: Update to 0.5.4.1.

* gnu/packages/skarnet.scm (s6-rc): Update to 0.5.4.1.

gnu: s6-networking: Update to 2.5.1.3.

* gnu/packages/skarnet.scm (s6-networking): Update to 2.5.1.3.

gnu: s6-dns: Update to 2.3.5.5.

* gnu/packages/skarnet.scm (s6-dns): Update to 2.3.5.5.

gnu: s6: Update to 2.11.3.2.

* gnu/packages/skarnet.scm (s6): Update to 2.11.3.2.

gnu: execline: Update to 2.9.3.0.

* gnu/packages/skarnet.scm (execline): Update to 2.9.3.0.