Fixes testing on 32-bit arches:

/core/general/test_setting_compare_timestamp:
(./test-general:29331): GLib-GObject-WARNING **: g_object_set_valist: object class `NMSettingConnection' has no property named `$?\xff\xff\x89t$0\x89|$4\xe8\u001c\x98\xff\xff\x85\xc0tM\x83\xf8\xfft3\x8dT$(\xc7D$\u0008'
/bin/sh: line 5: 29331 Trace/breakpoint trap   ${dir}$tst
FAIL: test-general

Fixes: 093a3c88