Don't encode build context path on Windows
Don't encode build context path on Windows

Signed-off-by: Joffrey F <2e95f49799afcec0080c0aeb8813776d949e0768@docker.com>

shin-/compose,schmunk42/compose,vdemeester/compose,sdurrheimer/compose,swoopla/compose,funkyfuture/docker-compose,swoopla/compose,jrabbit/compose,thaJeztah/compose,shin-/compose,dnephin/compose,funkyfuture/docker-compose,GM-Alex/compose,michael-k/docker-compose,thaJeztah/compose,sdurrheimer/compose,vdemeester/compose,dnephin/compose,schmunk42/compose,hoogenm/compose,GM-Alex/compose,hoogenm/compose,michael-k/docker-compose,jrabbit/compose