Merge remote-tracking branch 'Googulator/unxz'
Fix compilation of unxz with 64-bit M2-Mesoplanet
Further reduce unxz's memory usage
This does make decompression somewhat slower, especially on systems
with slow RAM, but without this, unxz was OOMing in Fiwix when
decompressing Linux kernel sources.
Fix unxz and add it to the build system
Added rough prototype of an unxz that M2-Planet can compile
but still needs work
Add wrap - A small bubblewrap like program (#18)
Remove VPATH from makefile.
Fix makefile install target
update M2libc to 1139b2bbf5f9c2618e52298917460ec75c345451
Do not include --operating-system flag itself in environmental variable.
Add OPERATING_SYSTEM_FLAG variable.
Add an optional executable suffix.