depends: Gitian 0.10 fixes

Github-Pull: #5465
Rebased-From: 422f873ef3d62f7dff9c00dc0f221912ce28f130 d546191dc28fac0e365c8f2aba47ac69a8920d6c d7db4b6317fd9c79bd6fd7c7455d7186b306411f e27d7cb24835c6ce16c12eb758c2d75806103c4a
signrawtransaction: validate private key.

Github-Pull: #5461
Rebased-From: aa768f1848b00e0fd615016598d3fb1f1da240ed
Fix download link for gitian builds

Rebased-From: 164a45f57a8a7367e67a5e65b9e938844730cd87
Github-Pull: #5471