Add LZMA decompression support

[ericdand]

I have a SquashFS file that's compressed with LZMA, and I'd love to open it with squashfuse! ;)

[andyn]

Today I came across an eons-old squashfs image that I could not mount with due to the lack of LZMA support. I find it rather surprising that the feature hasn't yet been ported, because LZMA support for squashfs images obviously has existed for a long time.

[vasi]

It should be pretty easy to add, I just haven't encountered such an image in awhile. Would you like to give it a try?

[vido89]

+1 for adding LZMA decompression support

[TheAssassin]

LZMA decompression is available:

• squashfuse/decompress.c

  Line 55 in 0b48352

  static sqfs_err sqfs_decompressor_xz(void *in, size_t insz,

• squashfuse/configure.ac

  Line 34 in 0b48352

  SQ_CHECK_DECOMPRESS([XZ],[lzma],[lzma_stream_buffer_decode],[lzma.h],[liblzma])

This issue can probably be closed.

[vasi]

The "lzma" you're seeing is a bit confusing. That's for "liblzma", which does xz decompression. But we still don't quite support old-style "raw LZMA" compression.

Dup of PR #37