resources: compiler: Fix resources on big endian architectures

resources: compiler: Fix resources on big endian architectures

Resources are always little endian, so the gvdb is byteswapped. When looking
up the value, it would return a new byteswapped variant, making the data
returned from do_lookup() invalid once that variant is unref'd. Since
byteswapping doesn't matter for the "ay" data anyway, just use
gvdb_table_get_raw_value() instead and only byteswap the length and flag
values.

https://bugzilla.gnome.org/show_bug.cgi?id=673409