Add build and package support to minijail

src/platform/minijail/minijail.cc

Index: src/platform/minijail/minijail.cc
diff --git a/src/platform/minijail/minijail.cc b/src/platform/minijail/minijail.cc
index 10d844ab284b718dc557f161ed178434cd1f9ee5..bd6c8d64cfbe1f6e7a871c13cfcee62a2224dc1d 100644
--- a/src/platform/minijail/minijail.cc
+++ b/src/platform/minijail/minijail.cc
@@ -15,6 +15,11 @@ bool MiniJail::Jail() const {
   // XXX This is a very early implementation of the jailing logic.
   // XXX Many features are missing or will be made more tunable.
   const minijail::Options *opts = options();
+  if (!opts) {
+    LOG(ERROR) << "No Options given. Initialize must be called first "
+               << "with a valid Option pointer.";
+    return false;
+  }
   const minijail::Env *env = opts->env();
 
   int namespaces = 0;