I've never tried it (--branch with a commitish) but theoretically this could work:
git clone https://github.com/hrydgard/ppsspp.git --branch v0.9.5-571-g7ec0069 --single-branch --recursive
-[Unknown]
git clone https://github.com/hrydgard/ppsspp.git --branch v0.9.5-571-g7ec0069 --single-branch --recursive
-[Unknown]

