Readd third_party/llvm-build to .gitignore
I thought it needed to be wiped to unblock https://codereview.webrtc.org/2588333002/
but it doesn't seem to be the case, so readding for now.
BUG=None
TBR=brandtr@webrtc.org
Review-Url: https://codereview.webrtc.org/2588423004 .
Cr-Commit-Position: refs/heads/master@{#15739}
diff --git a/.gitignore b/.gitignore
index e091870..2b0c549 100644
--- a/.gitignore
+++ b/.gitignore
@@ -104,6 +104,7 @@
/third_party/libxml
/third_party/libyuv
/third_party/llvm
+/third_party/llvm-build
/third_party/lss
/third_party/mockito
/third_party/modp_b64
