minui: do not use flexible array initialization

Avoiding the use of gnu extensions improves code portability

Change-Id: I441a49ce08b6ecb1d735ca453552fa92026c5016
correctly mount tmpfs as /tmp in recovery

The syntax of init's mount command changed in April 2008 but
recovery's init.rc was never updated, so recovery's /tmp has been on
the root fs all this time.  Fix.

Also add /system/bin to the PATH in recovery, which is handy for
debugging.

Change-Id: I39f7ae435a8ce3bad691e4b7c307db0bd8de1302
remove unused variable

Change-Id: Idb89503140a6a3385fe17990e3484fe71883885f