[oe] ipkg-build missing in tosa OZ 3.5.5 conf

[Junqian Gordon Xu]

bitbake nano failed with missing ipkg-build. 

Although I closed the bug report myself by downloading ipkg-build shell 
script from the internet, I would like to know whether it's my host 
problem or a dependency misbehavior. It could be because my bitbake-1.8 
at revision 802 is too old.

see bug report here:  http://bugs.openembedded.org/show_bug.cgi?id=2132

Gordon