Add turbo.cfg to .gitignore.

TBR=jarin@chromium.org

Review URL: https://codereview.chromium.org/664003003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24712 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

.gitignore

@@ -74,6 +74,7 @@ shell_g
 /tools/oom_dump/oom_dump.o
 /tools/visual_studio/Debug
 /tools/visual_studio/Release
+/turbo.cfg
 /v8.log.ll
 /xcodebuild
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