Update .gitignore files

Filter out all the generated bits from git revision control

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/.gitignore b/.gitignore
index 92f9a34..ae7a46a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,5 +5,8 @@
 *~
 *.tab.[ch]
 lex.yy.c
-dtc
-ftdump
+*.lex.c
+/dtc
+/ftdump
+/convert-dtsv0
+/version_gen.h