tests: Be stricter on valgrind leak checks

We used to ignore leaks, and we are ending up in having various of them,
so let's make valgrind to exit with error when using the valgrind test
setup (so in CI) to catch them better.

tests/libfprint.supp

@@ -0,0 +1,19 @@
+{
+   <ignore_dl_open_leaks>
+   Memcheck:Leak
+   fun:malloc
+   ...
+   fun:dlopen*
+}
+
+{
+   <ignore-gusb-get-string-desc-uninitialized-memory>
+   Memcheck:Param
+   socketcall.sendto(msg)
+   ...
+   fun:send
+   ...
+   fun:g_usb_device_get_string_descriptor
+   ...
+}
+

tests/meson.build

@@ -234,17 +234,26 @@ valgrind = find_program('valgrind', required: false)
 if valgrind.found()
     glib_share = glib_dep.get_pkgconfig_variable('prefix') / 'share' / glib_dep.name()
     glib_suppressions = glib_share + '/valgrind/glib.supp'
+    libfprint_suppressions = '@0@/@1@'.format(meson.source_root(),
+        files('libfprint.supp')[0])
     python_suppressions = '@0@/@1@'.format(meson.source_root(),
         files('valgrind-python.supp')[0])
     libfprint_wrapper = [
         valgrind.path(),
         '--tool=memcheck',
         '--leak-check=full',
+        '--leak-resolution=high',
+        '--error-exitcode=1',
+        '--errors-for-leak-kinds=definite',
+        '--track-origins=yes',
+        '--show-leak-kinds=definite,possible',
+        '--show-error-list=yes',
+        '--suppressions=' + libfprint_suppressions,
         '--suppressions=' + glib_suppressions,
         '--suppressions=' + python_suppressions,
     ]
     add_test_setup('valgrind',
-        timeout_multiplier: 10,
+        timeout_multiplier: 15,
         exe_wrapper: libfprint_wrapper,
         env: [
             'G_SLICE=always-malloc',