examples: make sure stdout is flushed
examples: make sure stdout is flushed

Change-Id: I95af7f5d5452a42b082d2226462ca946049c2a08

lifei/gopy,go-python/gopy-gen,ericsnowcurrently/gopython-gopy,ericsnowcurrently/gopython-gopy,go-python/gopy-gen,go-python/gopy,kellrott/gopy,lifei/gopy,go-python/gopy,kellrott/gopy