Create OMF_PATH when installing offline

Fix #787

bin/install

@@ -225,6 +225,8 @@ function install_offline
   if test -f "$OFFLINE_PATH"
     say "Offline path is a file, assuming tar archive..."
 
+    mkdir -p "$OMF_PATH"
+
     command tar -xf "$OFFLINE_PATH" -C "$OMF_PATH"
       or abort "Could not extract tar file $OFFLINE_PATH"
 

bin/install.sha256

@@ -1 +1 @@
-bb1f4025934600ea6feef2ec11660e17e2b6449c5a23c033860aed712ad328c9  install
+c15695106a9f2411863cedf1c68c85cb1c3433e81266abf4a6d8c6ad4a65b521  install