gitignore: add missing items

Add libtool and test-suite.log to .gitignore.

Change-Id: I2fad979a849b6b24f546dba89088ea1b8d63ef5f
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.gitignore b/.gitignore
index 5702b28..e2fe438 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,7 +30,9 @@
 zoneinfo-gen.cpp
 setsensor
 swampd
+libtool
 x86_64-libtool
 *_unittest
 *_unittest.log
 *_unittest.trs
+test-suite.log