autotools -> meson

Original commit message:

> There are some known regressions regarding local testing setups - since
> everything was kinda half written with the expectation that build dir =
> source dir (which should not be true anymore). But everything builds and
> the test suite runs fine, after several hours spent debugging random
> crashes in libpqxx with MALLOC_PERTURB_...

I have not experienced regressions with local testing.

(cherry picked from commit 4b886d9c45cd2d7fe9b0a8dbc05c7318d46f615d)

t/meson.build

@@ -0,0 +1,43 @@
+fs = import('fs')
+
+test('perlcritic',
+  perl,
+  args: ['-w', files('perlcritic.pl')],
+  workdir: meson.project_source_root(),
+  timeout: -1,
+)
+
+testenv = environment(
+  {
+    'BZR_HOME': meson.current_build_dir() / 'data',
+    'HYDRA_DBI': 'dbi:Pg:dbname=hydra-test-suite;port=6433',
+    'HYDRA_DATA': meson.current_build_dir() / 'data',
+    'HYDRA_HOME': meson.project_source_root() / 'src',
+    'PGHOST': '/tmp',
+    'PYTHONPATH': '',
+
+    # libpqxx seems to randomly crash with certain values of MALLOC_PERTURB_,
+    # set by default by Meson's test(). Very promising, high quality software.
+    'MALLOC_PERTURB_': '0',
+  },
+)
+testenv.prepend('PERL5LIB',
+  meson.current_source_dir(),
+  meson.project_source_root() / 'src/lib',
+  separator: ':'
+)
+testenv.prepend('PATH',
+  fs.parent(hydra_eval_jobs.full_path()),
+  fs.parent(hydra_evaluator.full_path()),
+  fs.parent(hydra_queue_runner.full_path()),
+  meson.project_source_root() / 'src/script',
+  separator: ':'
+)
+
+test('testsuite',
+  perl,
+  args: ['-I', meson.current_source_dir() / 'lib', '-w', files('test.pl')],
+  env: testenv,
+  workdir: meson.current_source_dir(),
+  timeout: -1,
+)