add rsyslog-config to gitignore

Add rsyslog binary to gitignore

Change-Id: I6e7262e3b0b53bbfe6e0f5a391153a6943d30711
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.gitignore b/.gitignore
index 285ed8d..a992ca3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,3 +42,4 @@
 test/test-suite.log
 test/*_test_*
 test/*_test
+phosphor-rsyslog-config/phosphor-rsyslog-conf