Changes to package source layout

[GoogleCodeExporter]

in Go 1.4, there is a change blow:
In the main Go source repository, the source code for the packages was kept in 
the directory src/pkg, which made sense but differed from other repositories, 
including the Go subrepositories. In Go 1.4, the pkg level of the source tree 
is now gone, so for example the fmt package's source, once kept in directory 
src/pkg/fmt, now lives one level higher in src/fmt.

so, godef can not find right place in 1.4.

Original issue reported on code.google.com by sandao.s...@gmail.com on 23 Dec 2014 at 1:43