Fix static binaries build

[td202]

Purpose

Fix static build of node. See: Concordium/concordium-base#570

Changes

• Update base with required fix.
• Fix warnings in the Dockerfile.

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.