/gdbus/message-serialize-invalid test: be compatible with D-Bus 1.4.8
/gdbus/message-serialize-invalid test: be compatible with D-Bus 1.4.8

Older versions of libdbus would let you construct an invalid
DBusMessage, but that's a bug, which will be fixed in 1.4.8/1.5.0.
Instead, construct a valid message of the same length, then replace
substrings in the serialized blob with their invalid counterparts.

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=646326

Signed-off-by: David Zeuthen <16a4bae6a7afea1fdd75baca6404fe68f285db96@redhat.com>

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