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
stat: fix printing selinux context and null-dereference

busybox stat tries to always print the selinux context, even if it
is not requested which leads to a segmentation fault due to
dereferencing a null-pointer.

This also changes the format-string used to print the context to
so it actually produces useful output.

Change-Id: Idfe15c931840457f357f860e560fca5b0480ad6f
busybox-full: enable some new applets

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

 Unsymlinked: switch_root (only useful in static version)

 setkeycodes can be used to map usb keyboard special keys
 or on devices like tablet pcs with special keys

 Tested on x86 and arm targets

Change-Id: Ib0655715897f4088a81efb4ca74731b60c14ac23