Use 500 MB memory limit for xz/lzma decoding

The buffers we feed in and read out are usually a couple kilobytes big
so allowing lzma to use an unlimited amount of memory is easy & okay,
but not needed and confuses memory checkers as it will cause lzma to
malloc a huge chunk of memory (which it will never use).
So lets just use a "big enough" value instead.

In exchange we simplify the decoder calling as we were already using the
auto-variant for xz, so we can just avoid the if-else and let liblzma
decide what it decodes.

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