Fix build on Ubuntu 22.04 and 24.04 (GCC 11+, Boost 1.74+)

[melvincarvalho]

Summary

Fixes build failures on Ubuntu 22.04 and 24.04 (and newer systems).

Tested on:

• Ubuntu 22.04 (GCC 11, Boost 1.74)
• Ubuntu 24.04 (GCC 14, Boost 1.83)

Changes: 5 files, +68/-20 lines (mostly the Dockerfile)
Code changes: 4 files, net +2 lines

Fixes

Problem	Solution
BDB 4.8 PPA dead	Dockerfile builds from source
ALIGN(64) inside #pragma pack(1)	Remove alignment, restructure
std::placeholders with boost::bind	Use boost::placeholders

Testing

docker build -f Dockerfile.build -t bitmark-builder .
docker run --rm bitmark-builder /output/bitmarkd --version
# Bitmark Core Daemon version v0.9.7.4-...-beta

Both 22.04 and 24.04 builds verified working.

Impact

• Breaking changes: None
• Consensus changes: None
• Pure build-system compatibility fixes

Fixes #137

[Copilot]

Pull request overview

This pull request fixes build failures on Ubuntu 22.04 and 24.04 (GCC 11+ and Boost 1.74+) by addressing three specific compatibility issues: replacing the dead Bitcoin PPA for Berkeley DB with source compilation, fixing incompatible alignment directives within packed structs, and correcting placeholder usage with boost::bind.

• Replaces std::placeholders with boost::placeholders in non-GUI code for Boost 1.74+ compatibility
• Restructures blake2.h to move alignment-sensitive structs outside pragma pack(1) blocks
• Adds Dockerfile.build that builds Berkeley DB 4.8 from source with proper patches for modern GCC

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/rpcserver.cpp	Updates two boost::bind calls to use boost::placeholders instead of std::placeholders
src/main.cpp	Updates wallet registration/unregistration functions to use boost::placeholders consistently
src/blake2s-ref.c	Changes blake2s_state from single-element array to direct variable for clarity
src/blake2.h	Removes ALIGN directives from packed structs and moves composite structs outside pack(1) block
Dockerfile.build	New Dockerfile that builds from source on Ubuntu 22.04, including BDB 4.8 compilation with GCC compatibility patches

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