Update gitignore

Add more items to clean up git.

Change-Id: I5c99b15ebe21d248d0853d84a505605e1da9b9c3
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.gitignore b/.gitignore
index 07dcd25..819b85b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,11 @@
 missing
 stamp-h1
 test-driver
+.dirstamp
+pidlist-gen.cpp
+sensorlist-gen.cpp
+zoneinfo-gen.cpp
+setsensor
+swampd
+x86_64-libtool
+