gitignore: misc files

Ignore all files generated from *_shipped files, plus a few others.

Signed-off-by: Brian Gerst <bgerst@didntduck.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/genksyms/.gitignore b/scripts/genksyms/.gitignore
new file mode 100644
index 0000000..be5cadb
--- /dev/null
+++ b/scripts/genksyms/.gitignore
@@ -0,0 +1,4 @@
+keywords.c
+lex.c
+parse.[ch]
+genksyms