misc/cgo/test: remove unused Makefile
misc/cgo/test: remove unused Makefile

R=golang-dev, minux.ma, iant
CC=golang-dev
http://codereview.appspot.com/6459091

tv42/old-go,apparentlymart/golang,tv42/old-go,tv42/old-go,apparentlymart/golang,gnanderson/go,pombredanne/go-deleteme,pombredanne/go-deleteme,dsriram/golang,dsriram/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,pombredanne/go-deleteme,apparentlymart/golang,tv42/old-go,dsriram/golang,apparentlymart/golang,gnanderson/go,pombredanne/go-deleteme,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,dsriram/golang,gnanderson/go,dsriram/golang,gnanderson/go,apparentlymart/golang,tv42/old-go,apparentlymart/golang,tv42/old-go,dsriram/golang,gnanderson/go,gnanderson/go