gobject: workaround gccgo compiling problem

Can't use the "gobject.c" name in gobject module, otherwise
`
error: redefinition of ‘gobject’
import "gobject"
                ^
note: previous definition of ‘gobject’ was here
`

Didn't know the really reason at this time. I will dig it later.

Change-Id: Id65506320bd2f4ebb357e153063fbc38863a7f10