Add some basic .gitignore files

This still leaves driver and architecture-specific subdirectories alone,
but gets rid of the bulk of the "generic" generated files that we should
ignore.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/scripts/.gitignore b/scripts/.gitignore
new file mode 100644
index 0000000..b46d68b
--- /dev/null
+++ b/scripts/.gitignore
@@ -0,0 +1,4 @@
+conmakehash
+kallsyms
+pnmtologo
+