Added a gitignore for all the autoconf/automake junk
Added a gitignore for all the autoconf/automake junk

goodheart/libextobjc,jspahrsummers/libextc,liuruxian/libextobjc,WPDreamMelody/libextobjc,telly/libextobjc,sandyway/libextobjc,jiakai-lian/libextobjc,sanojnambiar/libextobjc,bboyesc/libextobjc,jspahrsummers/libextc,sunfei/libextobjc,KBvsMJ/libextobjc,kolyuchiy/libextobjc,jspahrsummers/libextc