.gitignore: ignore *.lzma files

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/.gitignore b/.gitignore
index f3b09fe..e9950be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,6 +25,7 @@
 *.elf
 *.bin
 *.gz
+*.lzma
 *.patch
 
 #