Add nano editor to Android-x86 builds

[Carlos Estrague]

If you want to give a chance to this editor it works great for editing files :)

Add clone nano repo into external/ 

git clone   https://github.com/CyanogenMod/android_external_nano/ -b cm-13.0  nano 

Change these lines  in external/mksh/mkshrc

: ${TERMINFO:=/system/etc/terminfo}

: ${TERM:=vt100} to : ${TERM:=linux}

export HOME HOSTNAME MKSH SHELL TERMINFO TERM TMPDIR USER

In src/dot.mkshrc 

: ${TERM:=vt100} to : ${TERM:=linux}

You can nano edit into you rom :)