make gitignore happy with symlinks

See https://codereview.chromium.org/139473002 for similar CL.

R=djsollen@google.com, mtklein@google.com

Author: halcanary@google.com

Review URL: https://codereview.chromium.org/267543002

git-svn-id: http://skia.googlecode.com/svn/trunk@14484 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed