.gitignore: added unittest logging output

Added an ignore line for the unit-test generated output.

Change-Id: Ib6c2d1e6b01a67b9c4cbdfd35c421a4ab5c6f632
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.gitignore b/.gitignore
index 5a63451..5968b0e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,3 +25,8 @@
 missing
 stamp-h1
 test-driver
+*_unittest
+*_unittest.log
+*_unittest.trs
+libtool
+*~