This brings our meson-build-system closer to our gnu-build-system in terms of
using different installation prefixes based on the presence of outputs such as
"bin", "lib" or "include".
* guix/build/meson-build-system.scm (configure): Add --bindir, --libdir and
--includedir according to the presence of the "bin", "lib" and "include"
outputs, as done in gnu-build-system.
This change is motivated by the need to disable the default 30 seconds timeout
that Meson uses (see: https://gitlab.gnome.org/GNOME/glib/-/issues/2522), and
also by desire to specify extra options to run the check phase without having
to override it.
* guix/build-system/meson.scm (meson-build) <test-target>: Replace argument
with...
<test-options>: ... this one.
* guix/build/meson-build-system.scm (check): Invoke 'meson test' instead of
'ninja test-target', as the former is configurable via options.
* doc/guix.texi (Build Systems) <meson-build-system>: Update doc.
Because the debug files are read-only, the strip-runpath procedure would throw
an exception when attempting to open them.
* guix/build/meson-build-system.scm (shrink-runpath): Remove "debug" from the
list of outputs to be processed.
* guix/build/meson-build-system.scm (configure): Test for LDFLAGS before
adding ours.
(cherry picked from commit 611c27db2aec8c2f72bc0c1e5c7d126dc95b39b2)
