Snippets for glib 2.86.4 from FreeBSD 150arm64

Sourced from https://pkg-status.freebsd.org/ampere5/data/latest-per-pkg/glib-bootstrap/2.86.4,2/150arm64-default.log.

../gobject/gmarshal.c:325:13: warning: implicit conversion changes signedness: 'gint8' (aka 'signed char') to 'gchar' (aka 'char') [-Wsign-conversion]
  324 |   callback (data1,
      |   ~~~~~~~~
  325 |             g_marshal_value_peek_char (param_values + 1),
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

../gio/gnetworkmonitornetlink.c:403:18: warning: comparison of integers of different signs: 'int' and 'gsize' (aka 'unsigned long') [-Wsign-compare]
  403 |           while (RTA_OK (attr, attrlen))
      |                  ^~~~~~~~~~~~~~~~~~~~~~

../girepository/ginvoke.c:218:34: warning: implicit conversion changes signedness: 'char' to 'gint8' (aka 'signed char') [-Wsign-conversion]
  218 |       g_value_set_schar (gvalue, (char)value->v_long);
      |       ~~~~~~~~~~~~~~~~~          ^~~~~~~~~~~~~~~~~~~

../glib/tests/cxx.cpp:547:1: warning: non-void function does not return a value in all control paths [-Wreturn-type]
  547 | }
      | ^

../glib/tests/cxx.cpp:547:1: warning: non-void function does not return a value in all control paths [-Wreturn-type]
  547 | }
      | ^

../glib/tests/cxx.cpp:547:1: warning: non-void function does not return a value in all control paths [-Wreturn-type]
  547 | }
      | ^

../glib/tests/cxx.cpp:547:1: warning: non-void function does not return a value in all control paths [-Wreturn-type]
  547 | }
      | ^

../glib/tests/cxx.cpp:547:1: warning: non-void function does not return a value in all control paths [-Wreturn-type]
  547 | }
      | ^

gobject/tests/marshalers.c:103:13: warning: implicit conversion changes signedness: 'gint8' (aka 'signed char') to 'gchar' (aka 'char') [-Wsign-conversion]
  100 |   callback (data1,
      |   ~~~~~~~~
  101 |             g_marshal_value_peek_int (param_values + 1),
  102 |             g_marshal_value_peek_boolean (param_values + 2),
  103 |             g_marshal_value_peek_char (param_values + 3),
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

gobject/tests/marshalers.c:103:13: warning: implicit conversion changes signedness: 'gint8' (aka 'signed char') to 'gchar' (aka 'char') [-Wsign-conversion]
  100 |   callback (data1,
      |   ~~~~~~~~
  101 |             g_marshal_value_peek_int (param_values + 1),
  102 |             g_marshal_value_peek_boolean (param_values + 2),
  103 |             g_marshal_value_peek_char (param_values + 3),
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~