Fixed custom target dependency for d3_version.h

[pzychotic]

Pull Request Type

• GitHub Workflow changes
• Documentation or Wiki changes
• Build and Dependency changes
• Runtime changes
  • Render changes
  • Audio changes
  • Input changes
  • Network changes
  • Other changes

Description

cmake/CheckGit.cmake uses configure_file() to create d3_version.h in ${TARGET_DIR}/lib aka ${PROJECT_BINARY_DIR}/lib. But add_custom_command() and add_custom_target() calls in the root CMakeLists.txt use ${PROJECT_BINARY_DIR}/Descent3 as path to that file, expecting it in a different place. While the build still works, since the compiler looks in the right include paths for it, the dependencies between these rules/targets are technically broken.
At least msbuild will generate warnings about missing build outputs. You can see it on CI builds before we switched to Ninja: https://github.com/DescentDevelopers/Descent3/pull/429/checks#step:6:405

Also removed the wrong ALL parameter from add_custom_command(), it's only a valid parameter for add_custom_target().
See: https://github.com/DescentDevelopers/Descent3/pull/429/checks#step:6:406

Related Issues

Screenshots (if applicable)

Checklist

• I have tested my changes locally and verified that they work as intended.
• I have documented any new or modified functionality.
• I have reviewed the changes to ensure they do not introduce any unnecessary complexity or duplicate code.
• I understand that by submitting this pull request, I am agreeing to license my contributions under the project's license.

Additional Comments

[winterheart]

Thanks for pointing it out.