Add mountpoint directories

Oops, git ignores empty directories. Add '.empty' files to force git to create the desired moutpoint directories in our filesystem overlay. Fortunately, buildroot helpfully discards '.empty' files.
2015-04-02 19:11:39 -04:00 · 2015-04-02 19:11:39 -04:00 · 5ef586619b
--- a/fs-overlay/mnt/free1/.empty
+++ b/fs-overlay/mnt/free1/.empty
--- a/fs-overlay/mnt/free10/.empty
+++ b/fs-overlay/mnt/free10/.empty
--- a/fs-overlay/mnt/free2/.empty
+++ b/fs-overlay/mnt/free2/.empty
--- a/fs-overlay/mnt/free3/.empty
+++ b/fs-overlay/mnt/free3/.empty
--- a/fs-overlay/mnt/free4/.empty
+++ b/fs-overlay/mnt/free4/.empty
--- a/fs-overlay/mnt/free5/.empty
+++ b/fs-overlay/mnt/free5/.empty
--- a/fs-overlay/mnt/free6/.empty
+++ b/fs-overlay/mnt/free6/.empty
--- a/fs-overlay/mnt/free7/.empty
+++ b/fs-overlay/mnt/free7/.empty
--- a/fs-overlay/mnt/free8/.empty
+++ b/fs-overlay/mnt/free8/.empty
--- a/fs-overlay/mnt/free9/.empty
+++ b/fs-overlay/mnt/free9/.empty
--- a/fs-overlay/mnt/maemo/.empty
+++ b/fs-overlay/mnt/maemo/.empty