alienize lzma

[plicease]

this is a prereq for building from source.
we should maybe check for any other prereqs.

  CC       error.lo
  CC       parserInternals.lo
  CC       parser.lo
  CC       tree.lo
  CC       hash.lo
  CC       list.lo
  CC       xmlIO.lo
/Users/ollisg/.cpanm/work/1664117643.47564/Alien-Libxml2-0.17/_alien/extract_Y6LB/libxml2-2.9.10/xmlIO.c:40:10: fatal error: 'lzma.h' file not found
#include <lzma.h>
         ^~~~~~~~
1 error generated.
make[3]: *** [xmlIO.lo] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all] Error 2

[plicease]

Instructions actually say that all prereqs are optional:
https://gitlab.gnome.org/GNOME/libxml2#dependencies
so this may be brokenness of macOS bundled libs or something.