Remove time prefix from rsync (#11525)

Summary:
This fails with zsh saying "time: command not found".

cc soumith
Pull Request resolved: https://github.com/pytorch/pytorch/pull/11525

Differential Revision: D9772522

Pulled By: apaszke

fbshipit-source-id: b80d108fa6b174d68ada08a9fdbf7260ee37e08f
diff --git a/tools/build_pytorch_libs.sh b/tools/build_pytorch_libs.sh
index 3134bca..579cde7 100755
--- a/tools/build_pytorch_libs.sh
+++ b/tools/build_pytorch_libs.sh
@@ -12,7 +12,7 @@
 
 SYNC_COMMAND="cp"
 if [ -x "$(command -v rsync)" ]; then
-    SYNC_COMMAND="time rsync -lptgoD"
+    SYNC_COMMAND="rsync -lptgoD"
 fi
 
 # Options for building only a subset of the libraries