Update 7z to support LZMA2 properly
Update 7z to support LZMA2 properly

gwerz/theunarchiver,zammitjames/theunarchiver,cyranodb/theunarchiver,witwall/theunarchiver,zammitjames/theunarchiver,aleksejrs/theunarchiver,3van/theunarchiver,aleksejrs/theunarchiver,letup/theunarchiver,sereko/theunarchiver,dsp2003/theunarchiver,venj/theunarchiver,letup/theunarchiver,gco/theunarchiver,gwerz/theunarchiver,Bulat-Ziganshin/theunarchiver,aleksejrs/theunarchiver,gwerz/theunarchiver,siranwu/theunarchiver,dsp2003/theunarchiver,ethus3h/theunarchiver,markcox/theunarchiver,pombreda/theunarchiver,jianlinwei/theunarchiver,witwall/theunarchiver,sereko/theunarchiver,amolofos/theunarchiver,galaxy001/theunarchiver,Jarvik7/theunarchiver,gco/theunarchiver,pombreda/theunarchiver,nagyist/theunarchiver,jsdf/theunarchiver,3van/theunarchiver,pombreda/theunarchiver,jianlinwei/theunarchiver,jsdf/theunarchiver,markcox/theunarchiver,witwall/theunarchiver,ethus3h/theunarchiver,jsdf/theunarchiver,letup/theunarchiver,galaxy001/theunarchiver,dsp2003/theunarchiver,markcox/theunarchiver,siranwu/theunarchiver,Matiaz/theunarchiver,cyranodb/theunarchiver,siranwu/theunarchiver,Matiaz/theunarchiver,sereko/theunarchiver,Matiaz/theunarchiver,venj/theunarchiver,Jarvik7/theunarchiver,pombreda/theunarchiver-migrated,amolofos/theunarchiver,venj/theunarchiver,3van/theunarchiver,nagyist/theunarchiver,pombreda/theunarchiver-migrated,pombreda/theunarchiver-migrated,Bulat-Ziganshin/theunarchiver,amolofos/theunarchiver,ethus3h/theunarchiver,Jarvik7/theunarchiver,jianlinwei/theunarchiver,galaxy001/theunarchiver,nagyist/theunarchiver,gco/theunarchiver,cyranodb/theunarchiver,Bulat-Ziganshin/theunarchiver,zammitjames/theunarchiver