Fix building for Ubuntu 26.04 LTS

[PanderMusubi]

Describe the bug
Build doens't work on Ubuntu 26.04

To Reproduce

git submodule update --init --recursive
make

Expected behaviour
That it builds

Current Behaviour
Building fails.

Screenshots or Logs
In file external/cpr/include/cpr/callback.h add #include <cstdint> after #include <utility>

Also getting this error"

CMake Error at CMakeLists.txt:7 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

Please help to fix building on Ubuntu 26.04 LTS

[PanderMusubi]

Fixing that and other errors with:

rm -rf build.
cmake -S . -B build   -DCMAKE_POLICY_VERSION_MINIMUM=3.5   -DCMAKE_PREFIX_PATH=/usr   -DBUILD_SHARED_LIBS=ON   -Doxenmq_build_static_libzmq=OFF   -DWARNINGS_AS_ERRORS=OFF
cmake --build build -j$(nproc)