GitIgnore: Add dump_syms_mac

Change-Id: I4bbeb614e7477a42f096e1ba3fa7c00344827e0c
Reviewed-on: https://chromium-review.googlesource.com/411105
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/.gitignore b/.gitignore
index b2ef4c4..e177ccb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,6 +48,7 @@
 /src/tools/linux/symupload/minidump_upload
 /src/tools/linux/symupload/sym_upload
 /src/tools/mac/dump_syms/dump_syms
+/src/tools/mac/dump_syms/dump_syms_mac
 
 # Ignore autotools generated artifacts.
 .deps