Add time to the llvm_passes image

This fixes `make build-stats` failing when using the `llvm-passes` image, as the scheduled build does.
JuliaCI#240 did the same thing for the `package-*` images

Author: Zentrik

linux/llvm_passes.jl

@@ -24,6 +24,7 @@ packages = [
     "perl",
     "pkg-config",
     "python3",
+    "time",
     "wget",
     "zlib1g",
     "zlib1g-dev",