unzip: set ENABLE_DESKTOP to allow unpacking signed Android OTAs

Without this flag set, attempting to use BusyBox unzip to unpack a
signed Android OTA results in the error

unzip: zip flags 1 and 8 are not supported

Set ENABLE_DESKTOP for the unzip code to enable the necessary feature.

Change-Id: I3f764bde678311a8d3de787ea503f9cc793337a3
android-x86: fix building warnings of kitkat-x86

works also on arm platform, so...

Author:    Chih-Wei Huang <cwhuang@linux.org.tw>
Change-Id: Ic3ade475c5b92de26623e277170c71c49f9e41de
busybox-full: enable more applets

 chvt, deallocvt, fgconsole
 findfs, hwclock, lspci, nmeter
 openvt, powertop, rdate, setkeycodes
 smemcap, switch_root, tty

 tested on x86 project

Change-Id: Ib0655715897f4088a81efb4ca74731b60c14ac23